没有食物，我们就会挨饿；没有能量，我们会感到寒冷。

Without food we get hungry; without energy we feel cold.

youdao

现在，我假设，没有能量损失。

For now, I will assume that that's not the case.

youdao

我假设没有能量损失，尽管可能有一些。

I assume that there is no energy loss, although there probably is some.

youdao

Yes. In fact, there is not enough energy in a single photon to go ahead and eject an electron from this zinc surface.

是的，事实上，这里的光子没有足够的能量,去从锌表面逐出一个电子。

麻省理工公开课 - 化学原理课程节选

So in this case, we don't have enough energy to eject an electron, so, an electron is not ejected.

所以在这种情况下，我们没有足够的能量,去逐出一个电子，这样没有电子被逐出。

麻省理工公开课 - 化学原理课程节选

system is the opposite of the open system, no mass and no energy can flow through the boundary.

孤立系与开系正相反，没有质量或能量,能流过它的边界。

麻省理工公开课 - 热力学与动力学课程节选