Examples
tāng汤mǔ姆zhǐ shì只是yáo摇yáo tóu摇头。
汤姆只是摇摇头。
Tom just shook his head.
要发生的已经发生了，你摇头叹息也没用。
What's happened has happened; there's no use in whining and complaining.
例如，在保加利亚摇头表示同意而点头表示不同意。
For example in Bulgaria, shaking one's head means yes while nodding one's head means no.