必不可少

Stretching is an essential element of health.

伸展是必不可少的健康因素。

Good surface/subsurface drainage is essential.

良好的表面/地下排水系统是必不可少的。

This new method will contribute to the study on robot suction.

运动学方程对机器人控制来说是必不可少的。

A polarized sunglass is also essential, as it will help to see clearly through the water and lessen the glare.

两极分化太阳镜也是必不可少的，因为这将有助于清楚地看到通过水和减少眩光。

For the trade association in China, the superincumbent institutional force is absolutely indispensable.

对于后进国家而言，为了构建合理的行业协会法律制度，自上而下的制度推动必不可少。

The suppleness and flexibility of the vocal folds is crucial for pitch control, and it is especially important for hitting high notes with consistency and power.

声带的柔软和灵活性对音高控制是至关重要的，要唱出连续的或者有力量高音，声带的柔软和灵活性也是必不可少的。。。。

Swain (1985) that, despite the "comprehensible input" right language is essential, But understanding inputs itself is not enough to lead to successful language acquisition, the success of second language learners need not only comprehensible input, we need "understandable output."

Swain(1985)认为，尽管"可理解的输入"对语言学习是必不可少的，但理解性输入本身还不足以导致成功的语言习得，成功的二语学习者不仅需要可理解的输入，更需要"可理解的输出"。

In biological systematics as a whole, phylogenetic analyses have become essential in researching the evolutionary tree of life.

从生物分类学总体上看，在对生命进化树的研究中，系统发生分析已成为必不可少的要素。

Chinese Teaching Method is the important part of Chinese Teaching theory, it also the necessary tache in the Chinese Teaching.

语文教学方法是语文教学理论中的重要组成部分，也是语文教学实践中必不可少的环节。

Store system, brand image, is in an important tache wu service.

店面系统、品牌形象的实施，是于武服务必不可少的重要环节。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。