1. 取回;找回
    If you retrieve something, you get it back from the place where you left it.

retrieve

    e.g. He reached over and retrieved his jacket from the back seat...
           他伸手从后座上取回了自己的夹克。
    e.g. The men were trying to retrieve weapons left when the army abandoned the island.
           士兵们正试图找回军队从该岛撤退时留下的武器。

2. 使重新回到，挽回(某种局面)
    If you manage to retrieve a situation, you succeed in bringing it back into a more acceptable state.

    e.g. He is the one man who could retrieve that situation.
           他是唯一能挽回局面的人。

3. （计算机、大脑）检索，搜索（信息）
    To retrieve information from a computer or from your memory means to get it back.

    e.g. Computers can instantly retrieve millions of information bits...
           计算机可以立即检索到数百万条信息。
    e.g. As the child gets older, so his or her strategies for storing and retrieving information improve.
           随着孩子们长大，他们储存和检索信息的能力也会提高。