If you shake your head, you turn it from side to side in order to say "no" or to show disbelief or sadness. 摇 (头)
noun [具体名词] 震动；震惊；挥动，摇动
Shaking your head for 'No' is not universal. 以摇头表示“不”，并非放诸四海而皆准。
verb [vi. 不及物动词] 握手；摇动；颤动；使劲甩动；扰乱（shake 的现在分词）
I started shaking uncontrollably and began to cry. 我开始不由自主地颤抖，而后哭了起来。
- shaking 出现在下面的课文中（提供视频、音频及笔记等可系统性学习）
- Lesson 42 Recording and earthquake
