Hard work is essential. but there's also a time for rest and relaxation . 勤奋工作当然是必要的，但是每人也必须有时间休息和娱乐。
It was a point of politeness to walk towards the landing-place in order to receive them . 从礼貌方面说，走到码头去迎接她们是必要的。
In certain case it might be necessary to further decompose a spiral into convex subsets . 在某些情况下，把一个螺旋形进一步分解成凸子集是必要的。
We have already seen that the condition is necessary so we have to prove only the sufficiency . 我们已经看到此条件是必要的，故我们仅需证明其充分性。
Intellectual and emotional effort needed to comprehend form in its full spatial existence . 智力上和感情上的努力在理解空间实际存在的形体时是必要的。
In his view the primacy of the ethical over the aesthetic mode was necessary to restore the balance . 按照他的观点，伦理学的形式先于美学的形式，这对恢复平衡是必要的。
It is impossible to design a gyroscope which would meet all these requirements, and a compromise is always necessary . 不可能设计一个能满足所有这些要求的陀螺，因此折衷常常是必要的。
I do say that, if, after i have finished, you feel that death is necessary, then you are making an open choice . 我的确要说，等我发言结束以后，您要是觉得死亡是必要的，那么您就做公开的选择。
The employment of a brewer, and even that of a retailer of fermented liquors, are as necessary divisions of labour as any other . 酿酒家的职业，甚至小酒贩的职业，与其他职业同是必要的分工部门。
This is necessary in order for the system to learn the identity of the speaker and thereby achieve high recognition performance . 为了使系统学会辨别授话者，从而达到高的识别性能，这样做是必要的。
