build up

这将有助于增强他的信心。

This will help to ___build ___up his confidence.

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.

过去，面对面会谈是建立关系所必需的。

In the past, face-to-face meetings were necessary to ___build ___up relationships.