有困难

Some references indicated that the reachability of a Petri net can be analyzed by solving its state equation and judging whether or not there exists a legal firing sequence whose firing number vector is a solution of the state equation, but it is somewhat difficult to achieve.

已有文献提出通过解petri网的状态方程并判定是否存在以它的某个解为发生数向量的合法引发序列来分析petri网的可达性，这往往有一定的困难。

The most common presenting symptom was intolerance to feed, encountered in 51 of the patients, followed by stridor in 32 patients.

最常见的症状是喂养困难，有51名患者出现此症状，其次是喘鸣，有32名患者出现症状。

Key Laboratory of Computer Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences.Shanghai(200032)Abstract : The most usual problems encountered in the structure handling are tautomerism, alternating and aromatic systems. Though a number of methods have been reported in the literature, a common disadvantage is that only the convenience for processing were taken into account, but their chemical sense was rarely considered.

化学结构计算机处理中最常遇到的困难是互变现象、交替键和芳香键的处理，尽管解决这些问题的方法早有报道，但它们都有仅考虑计算机处理的方便，而很少注意其化学应用的不足。

The higher life quality the grandmother have, the higher will they accept to grandparent in the future.(4) From the results of multiple regression, the total variances that the family member characteristic and grandparenting behavior can explain is about 24.5%. The priority of the variances are as follows. 1.The characteristics of grandmother (including age, education, spouse condition, economical condition, income and the type of living, 17.1%). 2.The difficulty of childcare (6.8%). 3.The characteristics of parents (including marriage condition and if the parents assit childcare, 3.1%), 4. The types of childcare (1.8%), 5. The age of grandchildren (1.0%). 6. The reason of childcare (for the child, for the parents or for the grandparents, 0.5%). 7. The assistance to childcare (0.3%).

经由多元回归分析，家庭人口特徵、带孙行为可解释生活品质的总变异量为24.5%，各变项可解释的变异量依序为祖母人口变项（含祖母的年龄、祖母的教育程度、祖母是否有配偶、自觉经济状况、生活费来源、居住型态）（17.1%）、照顾的困难程度（6.8%）、孙子女父母相关变项（含孙子女父母是否为已婚或同居、孙子的父母是否提供协助、父母是否因工作而未自行照顾）（3.1%）、照顾类型（区分为全职照顾、日托照顾、半日托照顾、兼职照顾）（1.8%）、照顾孙子的年龄（1.0%）、照顾理由（区分为为孙子著想、为孙子女的父母著想、为祖母自己著想）（0.5%）、有无照顾协助者（0.3%）。

The moral argument of law will be interrupted by Munchhausen - Trilemma and Hume s problem. Although the linguistic argumentation has many difficulties such as complex concept meaning, the linguistic rules provide a new possibility for legal argumentation. However, as an argumentation theory, which is different from the traditional legal argumentation theory, the explanation viewpoints and judging standard it provided are valuable.

对法律进行道德论证会遇到"明希豪森困境"和"休谟问题"的干扰，语言学规则为法律论证提供了一种新的可能，虽然语言学论证中也会有诸如概念含义过于复杂等困难，但是，作为一种不同于传统法律论证理论，其所提供的解释视角和评判标准则是很有价值的。

At first glance, Blatche seems like a no-brainer for the All-Breakout squad. He made a sharp improvement last season, he's only 22, and the incumbent starter at his position was just declared out for the season. Unfortunately, that pesky six-foul rule may prove to be his undoing. Blatche averaged 6.02 fouls per 40 minutes; with a rate that high and the current ultraconservatism that coaches use with foul trouble, it will be extremely difficult for him to average more than 25 minutes a game.

乍一看，布雷彻在这个阵容中就像个打球不用头脑的人上个赛季，他有很大的进步，而他只有22岁，球队刚刚宣布他是这个赛季的那个位置上的首发，不幸的是，六次犯满的规则可能让他毫无作为，因为每40分钟他有6.02次的犯规，犯规的频率很高，而球队的教练是个极端保守的人人，对于犯规麻烦更是苛责，对于布雷彻而言，每场上场超过25分钟是一个极为困难的事情。

However,Although Chinese children,youth even college students' achievements in text study is not worse than American children,their disposition appears more passive:reluctant in behaving,timid,reliable,wanting comunication capability and self-reliance,uncapable of financial management,unsuitable of independent living.to be short,deficient in social living.there characteristics of Chinese children unquestionably have a deep tie with China's "Diplomacy Orentational Education".

我们可从中美两国家庭教育结果的比较中略见一斑：一般而言，美国的儿童、少年从小就表现出以下特点：性格倾向积极，遇事镇定沉着，能与人和谐相处，开朗、胆大，有克服困难的毅力，敢想、敢做，具有创新精神；自立能力强，社会活动能力强，有作为社会成员独立存在的信心和勇气，他们18岁开始不依靠家庭，多数打工补贴自身的消费需用；具有适应市场经济的头脑，他们从小就参与"当家理财"，学会一些推销、与顾客沟通的能力等"经营之道"，实践使他们深知钱来之不易，从而养成了精打细算、勤俭度日的习惯。

Think about what you can reasonably accomplish the rest of the week and if any of your planned tasks command to be puITd to the very beside week due to emergency projects or unforeseeing hurdles.

考虑一下余下时间里还能完成哪些任务；另外，有么有因该紧急工程的呈现，或未预见的困难导致某些商量中的任务要被推迟到下一周。

For all its recent difficulties, private equity still has plenty going for it—not least an estimated $400 billion of uninvested capital.

面对目前的困难，私募股权公司依旧有很多有利条件——至少他们手里有约有四千亿美元的闲置资金。

There would be some difficulties," he says,"but wed also gain a lot.

要达到那样的程度是有相当困难的，"他说，"但我们也能在研究道路上有不少收获。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐