at rest

形容词 at rest:

1. in a state of repose or especially sleep
2. dead
   同义词：asleep, at peace, deceased, departed, gone

1. According to Newton's first law, a body at rest will remain at rest until a force is applied to it.
   根据牛顿第一定律，如果不对物体施加力的话，静止物体会一直保持静止。
2. My father has been at rest since I was a girl.
   在我还是小女孩时，我父亲就已去世了。
3. Her words set my mind at rest.
   她的话使我放心。
4. You can keep your mind at rest about the matter, it's all set.
   你放心吧，这件事已经解决了。