He also presented a plethora of empirical evidence to back up these points.

他也提出了过多完全跟据经验的证据支持这些点。

Hop here, picka pen and hop back up .

跳到这里，捡起一支钢笔再跳回去。

Clogged pipes caused drain water to back up into the room.

水管堵塞， 排出去的水倒灌入室。

※A good book is a best friend who never turns his back upon us. 一本好书，莫逆之交。
※As soon as you have drunk, you turn your back upon the spring. 忘恩负义。

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