这将有助于增强他的信心。

This will help to ___build ___up his confidence.

交通通常在傍晚时分变得拥堵。

Traffic usually ___builds ___up in the late afternoon.

可能需要很长时间建立起来的东西，可能在很短的时间内被毁掉。

What might take a long time to ___build ___up could be ruined in a very short time.