be under the necessity of

The calculation and analysis lead us to know that there arises the necessity of considering the nonlinearity of piezoelectric material because of the deformations swift departures linear result under strong field of electricity and linear analysis can be used under low field of electricity.

计算分析表明：在强电场的作用下变形会迅速偏离线性结果，此时必须考虑非线性压电效应，而线性分析只适合于低电场的情况。

Except as specifically provided otherwise by GPW and gc, the activities of representatives or delegates of the protecting powers under these conventions may not be restricted even in case of imperative military necessity.

除特别由日内瓦战俘待遇公约与日内瓦公约明文规定外，在此公约下，即使军事上有必要，保护国代表或代表团之行为亦不得受限。

Necessity and feasibility of medical terminology course in higher medical schools in China and the textbook of medical terminology should be written under the surveillance of the state department of medical education.

试论国内医学院校开设医学术语学必修课的必要性与可行性医学术语学教材应该由国家医学教育部门统一编写。

it is well, therefore, that men should be under the necessity of exerting themselves.

它是很好，因此，人应该是在必要之下施加。

Me, she had dispensed from joining the group; saying,' She regretted to be under the necessity of keeping me at a distance.

而我呢，她恩准我不必同他们坐在一起了，说是她很遗憾，不得不让我独个儿在一旁呆着。