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We cannot always have associative law for operations, for instance, we did not have this law for mixed addition and multiplication,neither for subtraction, 2+3 2+1≠(2+3)(2+1)=5 3,（2-3）- 2≠2-（3-2）,this is why we have to set the rule in operations that "doing inside bracket at first and out side afterwards, doing multiplication and dividing first and addition and subtraction afterwards".

注意运算的结合律并不是永远对的，比如加法和乘法的混合运算就没有结合律，减法也没有，2+3 2+1≠5 3，（2-3）- 2≠2-（3-2），因此我们运算中总是规定先括号内再括号外，先加减后乘除。

"Ji-Li" means close fortuitous and avoid inauspicious, or bring big fortune. And the word of "Ding" is the assonance of "Light", which has the significant meaning of bringing the prosperity of money and population. The year of 2006, the Dog year in the Chinese lunar calendar, is also the first Dog year in the twenty first century. The work of "Ji-Li Ding" created by Taiwanese artist, Akibo, is using concisely line to produce technological and futurity forms rather than immature cartoon format. Besides, the idea of using the red signet express the origin of our culture and character which has combined the meanings of traditional concepts and future prospects includes creativity, fashion, and traditional culture aspects. And, it also conveys the character of dogs – curiosity, loyalty, and courage.

吉利」是人民在年节时分殷切的期待—「趋吉避凶」、「大发利市」，「丁」则与「灯」的闽南语谐音，深具「添丁发财」、「人丁兴旺」的意涵。2006丙戌狗年，也是21世纪的第一个狗年，艺术家李明道Akibo创作「吉利丁」，作品的造型跳脱俗化幼稚的卡通感，反以俐落简约的线条勾描出科技感与未来性，饱满纯净的用色与圆章的创意，则又彰显文化的起源与特色，揉合传统与眺望未来，兼具创意、时尚及文化传统，也同时拥有狗儿热情顽皮的特性，也具有忠诚与骁勇的意涵。

Taking electrostatic field as an example problem, based on the general analytical series solution of electrostatic field,(1) the zero, first and second order asymptotic boundary conditions on circular truncation boundary; and (2) the zero and first order asymptotic boundary conditions on arbitrary polygonal truncation boundary are derived.

有限元法计算无界电磁场问题是电磁场数值分析中的一个重要课题，在这里计算精度与计算量之间的矛盾尤为突出。

But this was the beginning of the first wrong choice made at that first fork in the road of Life.

不过，这是开始的第一个错误的抉择，作出了在第一次岔路口的生活。

Now, I know at first blush, Now, I know at first blush

嗯， 我知道，初听起来，这个说法；嗯，我知道，初听起来，这个说法

"At first I thought it was a bad season, that was my first reaction," he said.

"最初我想这是个糟糕的赛季，这是我的第一反应，"他说。

China's success from the first atomic bomb, declared no- first -...

中国从第一颗原子弹爆炸成功，就宣布不首先。。。

First Minister Ian Paisley and Deputy First Minister Martin McGuinness were two of the early visitors to the store yesterday morning, pronouncing that it was an important commercial development for Northern Ireland, and an augury of positive investment to come.

第一部长Ian Paisley和第一副部长Martin McGuinness是昨天早上贝尔法斯特店最早的两位客人，他们说这对北爱尔兰是重要的商业发展，预示者积极投资的到来。

In low age larva is filled period the effect of prevention and cure to garlic root maggot undertakes different drug experiment and be investigated, the result makes clear: 27 years garlic root maggot produces 3 generation in Jiangsu, generation of live through the winter is imaginal in March the last ten-day of a month fills hair; the middle ten days of a month on April fills generation larva hair, the middle ten days of a month saw in May aurelian, the last ten-day of a month was; of fastigium of generation imago ascend to heaven and become immortal in May the 2nd generation is larval the first ten days of a month was filled to the middle ten days of a month in June hair, the last ten-day of a month came in June in September the last ten-day of a month with aurelian more summer, 2 generation are imaginal at; of the ascend to heaven and become immortal at the beginning of October coming by September the 3rd acting larval fastigium is on October the middle ten days of a month, the first ten days of a month is larval in November in succession pupate live through the winter, immediately following in time year of spring (the middle ten days of a month on April) begin emergence.

在低龄幼虫盛期就不同药剂对大蒜根蛆的防治效果进行试验和调查，结果表明：2007年大蒜根蛆在江苏发生3代，越冬代成虫于3月下旬盛发；第一代幼虫4月上中旬盛发，5月中旬见蛹，5月下旬为一代成虫羽化高峰期；第二代幼虫6月上旬至中旬盛发，6月下旬至9月下旬以蛹越夏，二代成虫于9月底至10月初羽化；第三代幼虫高峰期在10月上中旬，11月上旬幼虫陆续化蛹越冬，翌年春季(4月上中旬)开始羽化。

Aurora's business philosophy: quality first, customer first, market-oriented, customer at the core.

极光人的经营理念：品质第一、顾客至上、市场为导向、客户为核心。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。