Body language is an important aspect of performance. An actor's body language plays a crucial part in telling the audience about the character they are playing.
肢體語言是表演的一個重要部分。一個演員的肢體語言在告訴觀眾他們表演的角色起到了重要的作用。

Body language is the way in which our bodies communicate our own or a character's attitudes. An audience or viewer can watch it to pick up on someone's age, emotions, status, or health.
肢體語言是表達我們自己或者角色態度的一種方式。觀眾通過觀察就能注意到某人的年齡、情感、地位或者健康了。

For example, a student being told off by a teacher in a drama can easily tell the audience that she's not feeling sorry for what she's done by:

curling her lip
showing a bored look in her eyes
having her head slightly lowered
putting a hand on her hip
having her hip stuck out, with her weight on one leg.
An example of body language

來源:可可英語 http://www.ccdyzl.cn/read/201106/140298.shtml