1. 揭露，发现（隐秘之事）
    If you uncover something, especially something that has been kept secret, you discover or find out about it.

    e.g. Auditors said they had uncovered evidence of fraud...
           审计人员说他们已经发现了欺诈的证据。
    e.g. A specific plot to kill him was uncovered in the past couple of weeks.
           一个针对他的暗杀阴谋在过去几周里被揭露了出来。

2. 发现，发掘（地下埋藏之物）
    When people who are digging somewhere uncover something, they find a thing or a place that has been under the ground for a long time.

    e.g. Archaeologists have uncovered an 11,700-year-old hunting camp in Alaska.
           考古学家在阿拉斯加发现了一个距今11,700年的狩猎营地。

3. 揭开…的盖子；除去…上的覆盖物
    To uncover something means to remove something that is covering it.

    e.g. When the seedlings sprout, uncover the tray.
           秧苗发芽后，就把盘子上的盖子拿掉。