他冲向楼顶，向下面的购物者扫射。

He ran to the top of the building, spraying bullets into shoppers below.

《柯林斯英汉双解大词典》

顶部图层应当指向下面的图层。

The top layer should now point down to the layer beneath.

youdao

两段楼梯通向下面一层楼。

Two staircases lead to the lower floor.

youdao

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