In general, the heavier atoms in the atmosphere sink and the light ones remain at the surface, which is why some white dwarfs, for example, have mostly pure hydrogen or helium atmospheres.

总体来说，较重的原子在大气圈中沉积，而较轻的原子则存在于大气圈表面，这也是一些白矮星具有较纯净的氢和氦大气圈的原因。

youdao

At the time it was very far from commonsense and it's a mark of how far we have come that we now accept the ultimate principles of science are ones that we cannot hope to base on pure reason.

但是当那些内容远没有成为常识的时代，当我们如今已经接受的，自然科学和最终原理还未被采纳的时代，我们不能寄希望于纯粹的推理。

youdao

In the functional version, I extracted the pure functions (ones that have no side-effects) into their own class, calling them by supplying parameter values.

在函数式版本中，我提取了纯函数(即没有副作用的函数)并将其放入它们各自的类中，通过提供参数值来调用它们。

youdao

Giants like General Electric and Honeywell are involved, too, but Peters argues that the best chance for investors to cash in on the security trend is with the pure-play small fry (albeit ones with commercial applications, too).

FORBES: Magazine Article

Lesser ones have pure tackling machines who run around incessantly, recover the ball and lay it off to more skillful teammates.

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