必需的

It is therefore necessary to identify the multiple inputs and reservoirs that interact.

因此判别多个输入和交互作用的水库是必需的。

Size and settling velocity are necessary to the description of sediments.

粒径和沉速的频率分布特性对于描述泥沙都是必需的。

Retinoic acid is essential in cell differentiation the function that determines what type of cell forms and how long it lives.

维甲酸对于细胞分化是必需的，细胞分化具有决定细胞类型和其存活时间的功能。

That is the bargain that makes this work. That must be the guiding principle of international cooperation.

这是成功的必要条件，也是国际合作所必需的指导原则。

The main process is the conversion of malt into beer and therefore yeast is needed.

麦芽转变为啤酒这一过程中酵母是必需的。酵母管理是非常重要的。

You don't send troops to war without the body armor that they need.

你不要把连必需的盔甲都没有的部队投入战争。

These essential fats are believed to assist in brain, nerve and visual development.1

脂肪酸是促进大脑发育所必需的产品，可以帮助脑部神经和视力的发育。

Then press the jog dial on the side up/down to select the required number.

然后压在边上的慢跑刻度盘提高/？？落选择必需的数字。

Coat hangers and dress hangers are necessary to keep clothes neat.

挂上衣和连衣裙的衣架是保持衣服整洁所必需的。

The availability of necessary airmen who have been issued licences according to law; and

有必需的依法取得执照的航空人员

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％。