a person or thing that changes something, usually in order to improve it 改变者;改进者 The whole experience was a life changer for me. 这整个经历改变了我的一生。 The biggest mistake made by would-be career changers is waiting too long to start the process. 想要改变职业生涯的人犯的最大错误是等待太久才开始这个过程。
a piece of equipment that holds several discs, etc. and is able to switch between them (光盘等的)换片装置;光盘转换器; 光碟更换器