Collision theory
[化] 碰撞理论
🧩 词语组成解析
🗣️ 情景例句
Turn the key before you pump the pedal, or you'll flood the engine.
加水之前转动钥匙，要不发动机就给浇灭了。
An empty sack cannot stand upright.
空麻袋，立不直。
He found it very difficult to get to sleep and he was rather angry with the man upstairs.
他觉得这样很难入睡， 他对楼上的人相当生气。