Backpitch
反螺旋; 背节距
🗣️ 情景例句
I did not notice it until yesterday.
我一直到昨天才注意到它。
I took off my hat.
我摘下了我的帽子。
I'm afraid some people forgot to sweep the floor.
它不如平时干净，恐怕是一些人忘记扫地了。