Libration
n. 摆动, 天平动
🗣️ 情景例句
if it's all right with your dad.
假如你爸爸答应的话。
If two men ride on a horse, one must ride behind.
两人同骑一马，必有一人在后。
Hasn't Mary told you?She invited Charlotte and me to dinner this evening.
玛丽没有告诉你吗？她邀请我和夏洛特今晚去吃饭。