He winked at his friend as a sign of their secret plan.

他向朋友眨眼，作为他们秘密计划的信号。

同一单元的其他句子

• Body language can convey emotions without using words.肢体语言可以在不使用言语的情况下传达情感。
• She crossed her arms to show she was not interested.她交叉双臂以表示她不感兴趣。
• Why do people from different cultures use different gestures?为什么来自不同文化的人使用不同的手势？
• Nodding your head usually means agreement in many countries.在许多国家，点头通常表示同意。
• Don't stare at others; it is considered rude in some cultures.不要盯着别人看；在某些文化中这被认为是不礼貌的。