查询词典 if and only if

As a result, if the iridescence is produced by thin-film interference, not only the thickness of lamellar structure must be defined within a certain nanometer, but also the refractive index need to be different between lamellar structure. In other words, the chemical composition, refractive index and thickness of exsolution lamellae need form to trinity, such as labradorite, albite, andradite and orthoamphibole. If the iridescent color is produced by grating-diffraction, the lamellar structure just needs to be arrayed regularly, the spacing of the edges of lamellar structure needs to be regular and narrow, but not necessarily within the range of the wavelength of visible light, such as shell of abalone, pearl and opal.

薄膜干涉式晕彩不仅要求宝石内部结构层的厚度必须在一定的纳米范围内，而且结构层内部的折射率也必须有所差别，也即，当结构层由两相组分出溶而成，其化学成分、折射率和结构层厚度形成三位一体时，符合薄膜干涉式晕彩，如拉长石、钠长石、石榴石和角闪石；而光栅式衍射晕彩则仅要求结构层排列规则，边缘狭窄但不需要窄到可见光波长范围内，能使入射光的振幅或位相，或两者同时产生周期性空间调制的结构即可，如鲍贝壳、珍珠和欧泊。

The experiment of pretreatment shows that polyurethane foam can be washed clearly in both organic and chemical unoil, good effects of coarsening can be gained only if polyure foam can be squeened repeatly and uniform mass loss between 2.0 and 3.0mg·cm~(-3). The result of activation is perfect even if the cheaper silver nitrate instead of expensive palladium bichloride is used as active agent in the experiment. The influence on quality of chemical plating, conductivity, depositon rate by the kinds of reduction, silver contents, PH and stabilizing agent was studied.

预处理实验结果表明：采用有机除油和化学除油即可清除聚氨酯泡沫表面油污；反复充分挤压泡沫，控制聚氨酯泡沫均匀减重2.0～3.0mg·cm~(-3)可获得良好的粗化效果；用硝酸银型代替氯化钯做活化剂，并施以适当的工艺同样可取得良好的活化效果。

If you do declare variables, functions, or namespaces at the top level of a package, the only attributes available at that level are public and internal, and only one package-level declaration per file can use the public attribute, whether that declaration is a class, variable, function, or namespace.

在包顶层定义的这些元素的属性只能为public和internal(只对包中的其他成员可见)，并且每一个文件中只能有一个包层面的元素定义为public属性，不管这个元素是类、变量、函数还是命名空间。

You who are letting miserable misunderstandings run on from year to year, me aning to clear them up some day; you who are keeping wretched quarrels alive bec ause you cannot quite make up your mind that now is the day to sacrifice your pr ide and kill them; you who are passing men sullenly upon the street, not speakin g to them out of some silly spite, and yet knowing that it would fill you with s hame and remorse if you heard that one of those men were dead tomorrow morning; you who are letting your friend's heart ache for a word of appreciation or sympa thy if only you could know and see and feel, all of a sudden, that "the time is short" how it would break the spell! How you would go instantly and do the thin g which you might never have another chance to do!

佚名你们有些人听任一些不幸的误会年复一年地继续存在，打算将来有一天再去澄清；你们有些人听任一些可怜的争执继续为害，因为你们不能现在就下定决心牺牲自己的自尊，消除那些争执；你们有些人在大街上遇见某些人的时候，由于某种愚蠢的怨恨，故意不同他们讲话，但是你们自己心里也知道，如果在明天早晨听说其中的某个人离开了人世，自己的心中一定会充满羞愧和悔恨之情；你们有些人吝惜一句感激或同情的话，因而使朋友在痛苦中等待——只要你们突然间知道、看到或感觉到"人生苦短"，那你们的心胸就会豁然开朗，不再沉迷于那些无谓的计较，你会马上去做一些如果现在不做以后也许就永远没有机会去做的事情。

Also because of the road turned to the bottom of the top players on the team at the top of the ramp, the rock loose the season still has the possibility of the Rolling Stones hit the players, Yakou the 50-100 m section of the rock surface is a monolithic block staggered zone, rock face an average of 6-7 meters high, 70-80 degrees slope is very smooth too laborious climb directly to undesirableGreat can not see well because of the snow line, and only a walk around the rock surface, in the cross section of rock surface from time to time is close to the ridge walk, the most recent is only one meter away from the cliff, and at the foot of ice or hard snow if the time is easy to slide down the ridge, more dangerous.

另外因为路线转向上方队员就在下方队员斜上方，岩石松动的季节还是有滚石击中队员的可能，垭口上50-100米路段，是整块整块的岩面交错的地带，岩面平均高6-7米，坡度70-80度，很光滑直接攀上太费力不可取，由于雪大看不出好的路线，只有绕着岩面走，在跨越岩面时有部分路段是贴着山脊走，最近的离悬崖仅一米，而且脚下如果结冰或者是硬雪时很容易滑下山脊，比较危险。

A solipsist, in case you don't happen to know the word, is one who believes that he himself is the only thing that really exists, that other people and the universe in general exist only in his imagination, and that if he quits imagining them they would cease to exist.

所谓惟我论者---假如你碰巧不知道这个词---就是这样一个人：他相信自己是惟一实际存在的东西，而他人及整个世界只存在于他的想象之中，如果他停止对他们的想象，那么他们便会消失。

All he asks for is peace; and he can only get peace through these men of no faith and no conscience, who are stifling and destroying everything, Magnitsky and Araktcheev, and tutti quanti …You will admit that if you did not look after your property yourself, and only asked for peace and quiet, the crueller your bailiff were, the more readily you would attain your object,'' he said, turning to Nikolay.

他只图清静。而只有那些丧尽天良、寡廉鲜耻的人，如马格尼茨基、阿拉克切耶夫之流，尽干伤天害理的事，乱砍乱杀，祸国殃民，才能使他得到清静……如果你不亲自来抓经济，只贪图安宁，那么你的管家越厉害，你的目的就更容易达到，你同意吗？他问尼古拉。

Car metal shell of the universe to do, is incomparably rigid body can be turned into small, car inside is a small bar, you only have one credit card, a small wine cooler will appear in front of you, take what you like to drink , the car is also a game room, if you want to play cards, and only you can be one person, this is, you have good points as long as the card, there will be a virtual characters and play cards with you.

车的外壳是宇宙金属做的，坚硬无比，车身可以变大变小，车的里面是个小酒吧，你只要一刷卡，一个小酒柜就出现在你的面前，你想喝什么就拿什么，车里也是一个游戏厅，如果你想玩纸牌，可只有你一个人，这是，你只要把牌分好，就会出现虚拟人物和你一起打牌。

Similarly, if the strong shear, which could suppress all the scattering in the quiescent two phase region, stopped, the follow-up phase separation also displayed characteristics of anisotropism and relaxation, In this dissertation, the transposed"butterfly'and"streakpattern were observed for the first time within the shear-history-influenced phase separation, which is found closely relevant to the anisotropical relaxation behavior of macromolecules. 5. The phase separation kinetics of PS/PVME under oscillatory shear was further studied on the base of that done under simple shear. It is found that, under specific temperature and strain amplitude, the occurrence of phase separation is strongly contingent on oscillatory frequency and only intermediate frequency could effectively induce phase separation; If all considered oscillatory shear could stimulate phase separation, a fixed frequency can maintain specific most probable phase size and higher frequency yields smaller phase, which makes a higher elasticity but weaker stress relaxation; Furthermore, higher frequency can produces stronger compulsory oscillation on the MPPS but won't change the mean of the MPPS. Under given frequency and strain amplitude, the phase separation kinetics dramatically depends on the phase angle of oscillation and the phase separation corresponding to different phase angle follows different dynamical process.

在简单剪切场下相分离动力学研究的基础上进一步对振动剪切场下PS／PVME的相分离动力力学进行了尝试性的研究，发现：在一定温度和振幅条件下，相分离的发生强烈的依赖于振动频率，只有中等频率的振动剪切才能有效地促进相分离的发生；在都能使相分离发生的前提下，一定频率的剪切能够使体系维持一定的最可几相尺寸，较高频率的剪切导致体系形成的相区尺寸较小，因而体系的弹性效应较强而应力松弛效应较弱；同时，更高频率的剪切对最可几相尺寸的强迫振动效应越强，但不会使最可几相尺寸的平均值发生改变；在一定的振幅和频率条件下，相分离的动力学过程会强烈地依赖于相位角，不同相位角对应的相分离遵循不同的动力学过程但机理一样。

That is already happened; the information and internet revolution has actually gone all the way through our societies in so many different ways, but it hasn't in every way, yet touched our government.So, how could this happen? Well, I think there are three chief ways that it should make and enormous difference, in transparency, in greater choice, and in accountability, in giving us that genuine people power. If we take transparency, here is one of my favorite websites, the Surrey Accountability Portal. In the old days, only the government could hold the information, and only a few elected people could try and grab that information and question it and challenge it. Now here, on one website, one state in America, every single dollar spent by that government is searchable, is analyzable, is checkable.

我认为有三种途径可以创造巨大的不同，透明度、更多选择及问责制度可以赋予我们真正的人民力量，先讲透明度，这是我喜爱的一个网站，Surrey 问责制度入口网站，往昔，仅有政府能握有资讯，仅有少数获选的人可以尝试取得那些资讯，质疑并进而挑战，现时，仅需一个网站，美国一个州的每一项政府支出都可以被找到、分析及检视，思考一下这重大改变所意味的是任何想参与政府合约竞标的商家，都可以看到目前的支出情形，任何能让服务更好，执行经费更低廉的商家，都能在此找到，我们的政府及政治才刚开始深入了解商界人士的作法，以资讯革命的方式。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷