dummy bit

例句：

1. 1. The actor played a dummy in the play to save his voice.
   演员在剧中扮演了一个替身来保护他的嗓音。
2. 2.She used a dummy bit to distract the audience during the performance.
   她在表演中用一个替身来分散观众的注意力。
3. 3.The dummy bit was so convincing that even the critics couldn't tell it from the real person.
   这个替身太逼真了，连评论家都分辨不出来真假。