Water is indispensable to plants.

水是植物不可缺少的。

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Everybody agrees that scientific research is indispensable to the nation's health, prosperity, and security.

没有人会质疑科学研究对于一个国家的繁荣昌盛和安全稳定是必不可少的。

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These are critical years to focus global attention on what should be obvious — that clean water is indispensable to sustain life.

这是一些重要的年份，使全球集中关注应该作为显而易见的问题—清洁水对于维持生命不可或缺。

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"I do not believe we ought to add troops in Afghanistan unless it is indispensable in our war against al-Qaida, "If it is, then we have to do whatever it takes because al-Qaida is out to annihilate us.

VOA: standard.2009.11.23

Certainly it's a thing we've come to feel is indispensable to our collective buoyancy.

CNN: Our romance with debt -- we'll pay later

India is indispensable to the future that we seek -- a future of security and prosperity for all nations.

WHITEHOUSE: U.S.-India Strategic Dialogue

Quick, granular feedback from customers is indispensable to a company, which is why we originally developed the Net Promoter system.

FORBES: The Root Cause Of Your Customer's Anger