Reaction force
[机] 反动力
🧩 词语组成解析
force
[fɔ:s]
n. 力;武力;（社会）势力;魄力;
vt. 强迫;强行;促使，推动;强奸;
🗣️ 情景例句
Why are you crying?
你为什么哭？
Children learn to creep ere they can go.
孩子要走路，先得学爬行。
What's wrong?
怎么了？