查询词典 be essential to

In this paper,the boundary singular kernel method in Reproducing Kernel Paicle Method has been applied to impose the essential boundary conditions in EFGM by revising the MLS shape function.The stress field and the displacement field are analysed by linear elastic theory.The contour integral method is used to calculate the J-integral,then the stress intensity factors of mixed-mode crack is acquired.The correctness and the validity of the method are validated.

本文将再生核质点方法中的边界奇异权方法引入EFGM中，通过对MLS形函数进行修正实现了本质边界条件在节点处的精确施加；运用线弹性断裂理论分析裂纹板的应力应变场，采用围线积分法计算J积分，给出了复合型裂纹板的应力强度因子的无网格伽辽金方法。

The life insurance contract is the essential means to embody the life insurance institutions.

人寿保险合同是寿险制度得以实现的具体手段。

Conclusions— Junctin is an essential regulator of sarcoplasmic reticulum Ca release and contractility in normal hearts.

结论-连接素是正常心脏肌浆网钙释放和收缩力的重要调节因素。

Expansion and contraction of blood vessels of normal blood flow is essential.

血管的扩张和收缩对血液的正常的流动是必需的。

In order to solve this contradiction, it is essential to make use of computer to managing salary.

为了解决这一矛盾，利用计算机来进行工资的管理，是十分必要的。

The essential cause of this situation is the contrariety between the limited water environmental capacity and the aggravating pollution burden.

南通市域内水环境形势恶化，未来有加剧趋势，其根本原因在于十分有限的水环境容量与逐年加重的水污染负荷之间的矛盾。

The use of contrasting plays an essential role in the discussion of revealing the main ideas of the book.

对比手法的运用在该著为表达主旨意图的论述中起到了不可或缺的作用。

These psychological and historical considerations are essential in order to understand the contrasting views of the US.

要了解亚洲和欧洲对美国的相反看法，考虑这些心理和历史因素是非常重要的。

And before you know it, what seemed like the latest annoying contrivance will be essential. A lot of it is remarkable.

更可悲的是，在你意识到这点之前，这些最新的、惹人厌的发明，似乎早已摇身一变，成了生活中不可或缺的部分。

These essential issues are the characters of the access control of the information grid.

信息网格访问控制研究的这几个关键问题是信息网格访问控制的特征。

Diabetes is a social disease that affects several million people worldwide.

糖尿病是一个社会性疾病，全世界有数百万人罹患此病。

I'll call you on Friday to see if we can reschedule our luncheon meeting at your convenience.

我星期五会给您打电话在您方便的时候我们重新安排我们的午餐约会。