只有当先进国家向发展中国家伸出援助之手时，世界才能变得更好。

Only when advanced countries extend a helping hand to developing countries, can the world be a better place.

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只有通过保护环境，我们才能向子孙后代承诺给他们一个美丽的地球。

Only by protecting the environment can we assure our later generation of a beautiful planet.

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只有那些有办法向这些岛屿传播种子的物种才能进行长途跋涉。

Only those species with ways of spreading seeds to these islands were able to undertake the long journeys.

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So what that means is that's how much energy we would have to put into a hydrogen molecule in order to get it to split apart into its two atoms.

它的意义,就是我们需要向一个氢分子中注入这么大的能量,才能将它分解成两个独立的原子。

麻省理工公开课 - 化学原理课程节选

Remember, because that 1 s orbital is all the way down in terms of if we're thinking about an energy diagram, we're all the way down here, so we have a huge amount of energy we have to put into the system in order to eject an electron.

还记得吧，因为1，s，轨道在能量示意图里,是在最底部的，我们要一直到最下面，所以我们要向这个系统注入非常大的能量,才能打出一个电子。

麻省理工公开课 - 化学原理课程节选