This is the story of wildlife conservation in the age of mass extinction.

这是个关于在大规模的物种灭绝时代保护野生动物的故事。

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Design and testing of these physical systems rely on standard design practices that employ the laws of conservation of force, mass, and energy.

这些物理系统的测试依赖于对作用力、质量和能量守恒定律的标准设计实践。

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We invoke Dalton's Law of molar proportions, we write it subject to conservation of mass.

我们援引了摩尔分数的道尔顿定律，要服从质量守恒定律。

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So, what's the conservation of mass if we divide by the atomic masses here?

那么质量守恒是什么呢？,如果我们在这儿按原子质量划分？

麻省理工公开课 - 固态化学导论课程节选

We invoke Dalton's Law of molar proportions, we write it subject to conservation of mass.

我们援引了摩尔分数的道尔顿定律，要服从质量守恒定律。

麻省理工公开课 - 固态化学导论课程节选

We write it subject to conservation of mass.

要服从质量守恒定律。

麻省理工公开课 - 固态化学导论课程节选

Research is being carried out by the Marine Conservation Society following mass strandings of moon jellyfish in north Wales.

BBC: Lion's mane jellyfish

Personally, I will bemoan the beach and park closings, the shorter library hours, the cuts in water, air, and soil conservation, and mass transit funding.

FORBES: The Crotty Plan: Cut 25% Off the Federal Budget Now