然而，凭借着绝对数量，苔藓和蕨类植物到达了夏威夷群岛，存活并且繁衍了下来。

By force of sheer numbers, however, the mosses and ferns reached Hawaii, survived, and multiplied.

youdao

史密斯和他的合作者的研究表明：到达深海的食物的数量随着时间发生巨大的变化。

Research by Smith and his coauthors has shown that the amount of food reaching the deep sea varies dramatically over time.

youdao

这是因为硫化物颗粒和煤烟颗粒在遮挡太阳能到达地面的数量不一样。

That's because the particles differ in the amount of solar energy that they prevent from reaching the ground.

youdao

So, if we want to go from that stable state to that less stable state, we need to put in a certain amount of energy to our system, that difference between the free electron and the electron bound to the metal.

所以，如果我们想使电子,从稳态到达不够稳定的状态，我们需要引入一定数量的,能量到系统中，即自由电子和束缚于金属的,电子的能量差。

麻省理工公开课 - 化学原理课程节选