His criminal activities were finally uncovered.

    他的犯罪活动最终被揭露出来。

    掩盖事实可以用cover up表示，例如：

    The authorities were able to cover up what really happened at the incident.

    当局设法掩盖了事件的真相。

    劈腿Two timing

    劈腿指一个人同时有两个或两个以上约会对象，俗称“脚踏两条船”，英语中有一个很形象的说法：two timing，例如：

    The poor guy, his girlfriend has been two-timing him for a while now!

    这家伙真可怜，他女朋友一直在脚踏两只船!

    劈腿族可以说成two timer(s) ......