Understructure
n. 基础, 下层结构
🗣️ 情景例句
I'm sorry, I spoke out of turn.
对不起，我说错话了。
One never loses anything by politeness.
有礼貌对自己不会吃亏。
Oh, cheer up!perhaps we didn't to do badly.
啊，别灰心！或许我们考得还不太糟。