必不可少

Inorganic compounds, particularly metallic ions and complexes, are essential cofactors in a variety of enzymes and proteins.

无机化合物，特别是金属离子和配合，是必不可少的辅助因子在不同的酶和蛋白质。

Inorganic compounds, particularly metallic ions and complexes, are essential cofactors in a variety of enzymes and proteins.

无机化合物，特别是金属离子和及其配合物，是很多酶和蛋白质必不可少的辅助因子。

Even those to whom his great strength had been a burden, those whom he had overshadowed, admitted when he had departed from the scene and they were faced with other orators and demagogues, that never again would they see a character of such precious moderation and such eminent humility; and that power which in their envy they had described as autocracy and tyranny, seemed to them now the very cornerstone of the survival of the State.

即使那些把他的力量看作是一种负担，被他所埋没的人现在也承认，当他们摆脱了他而遇到其他对手或煽动者的时候，他们再也没有遇到过如此珍贵的温和和如此卓越的人道了。他们曾经所描述的独裁专制的权力现在看起来却成了国家生存所必不可少的基石。

Although forest insects and pathogens cause various detriments,they also make positive contributions to forest succession,material cycling and energy flow,a food source,creating wildlife habitat,etc.,and further,in an ecosystem perspective their contributions are critical to forest biodiversity,soil fertility and long-term forest health and sustainability,so forest managers must consider both the detrimental and beneficial functions of insects and pathogens.

森林昆虫和病原物虽然能引起林木损伤与死亡，但它们在森林演替、物质循环和能量流动、食物来源、创造野生动物生境等方面都作出了积极的贡献，而且在一个生态系统发展前景中，对于森林生物多样性、土壤肥力、森林的长时期健康和稳定性等方面，它们的促成作用也是必不可少的。因此，森林经营者应当考虑昆虫和病原物的害与益的两方面作用。

Specially it is essential to downhole closed-loop automated drilling and intelligent drilling in the future.

尤其对于导向钻井、井下闭环自动钻井以及将来的人工智能钻井更是必不可少的重要一环。

The training programs for adult dyslexics have a couple of general essential components.

该培训计划的成人诵读困难有一对夫妇一般必不可少的组成部分。

Water is essential for all socio-economic development and for maintaining healthy ecosystems.

水是必不可少的所有社会经济发展和维持健康的生态系统。

Elevator is essential for people's lives nowadays. The number of elevators becomes larger and larger increasingly.

电梯是人民生活中必不可少的工具，电梯的数量在日益增加。

The administrator that enrols a few to be in charge of so is safeguarded together group it is essential one condition.

所以招几个负责的管理员一同来维护群是必不可少的一步。

Of course, exhaust fan is indispensable.

当然，排气扇是必不可少的。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。