An element is a simple substance that cannot be broken up into anything simpler.

元素是一种单质，它不可能再分成任何更单纯的物质。

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For your health, give this simple substance the importance it deserves.

为了你的健康，给予这个简单物质足够的重视吧。

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The turning-up of Fullerene and its Compounds, the third kind of allotrope of carbon in simple substance, has been taken a great interest in in chemical circles.

单质碳第三种同素异形体——富勒烯及其化合物的出现，已引起化学界的极大关注。

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"We've come a long way in 10 years, from simple ideas to really seeing some substance in the existence and tractability of targeting these funny structures, " he told the BBC.

BBC: 'Quadruple helix' DNA seen in human cells

According to the plan, when the homeless have found a permanent place to live, the state will offer them whatever social services they need to succeed in that house, from substance-abuse counseling to simple help in learning how to shop or how to balance a checkbook.

NPR: Chronically Homeless See New Woes in New Orleans