必需的

The use of deconstruct is in no way required, it is only provided in the hope it may be useful.

deconstruct 的使用绝不是必需的，提供它只是希望它有用。

" Tyrosine: One of the amino acids, not essential for humans unless they have the hereditary disorder phenylketonuria."

酪氨酸：一种氨基酸，对人体不是必需的，但患有苯丙酮尿症的人群除外。

The User Management is the essential function of any system, is also the foundation of other managements mold.

用户管理是任何系统所必需的功能，也是其他管理模块的基础。

Various lines of evidence suggest that nuclear actin is required for efficient transcription by RNA polymerases I, II and III.

众多前人实验证据表明，细胞核内肌动蛋白是RNA聚合酶I、II和III所介导的高效率转录所必需的。

In addition to this essential protein nutrients, the hair needs vitamins and polysaccharides and other nutrients.

除了这种必需的蛋白质营养，头发需要的维生素和多糖等营养成分。

In two patients, the viral genetic code for its many changes are necessary for escape from an attacker.

在两名患者中，病毒遗传代码中的许多变化对于其逃脱攻击来说都是必需的。

Once they have the computer at hand, those students who lack selfcontrol may be indulged in computer games or online chatting, which will waste their time and affect their health.

而最后一段下结论直接呼应了第一个问题——说明笔记本电脑不是必需的，只有同时符合两个条件时，笔记本电脑才是有益的。

But they contain it in a very small amount, and it's required right now for the operation of a fluorescent lamp.

就是汞，&他补充说，&但是含量很小，然而目前对于荧光灯的正常工作是必需的

That may become an essential talent, it occurred to Ziska, given the way our planet is going.

他进而想到，考虑到我们这个星球目前的变化趋势，这也许会变成一种必需的能力。

During the reign of Henry VII, France was a powerful country in Europe.

笔者认为，这不仅是非常重要的，而且也是非常必需的。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。