Derigueur
礼貌习惯上所必需的, 合乎礼仪的
🗣️ 情景例句
I was very sad indeed to hear about it.
听了这件事，我的确非常难过。
He has a radio,doesn't he?
他有一台收音机，对不对？
Let's go to the first island.
我们到第一个岛上去吧。