Take heart 鼓足勇气；振作起来

Take heart - to receive courage or comfort from some fact

Jimmy has been taking heart since  he met a pretty lady as a wife to be.  自从吉米遇见了一可以当老婆的漂亮女人后，他开始振作起来。

Mike should take heart because the situation is improving.  麦克应该振作起来，因为情况已有改观！