Indispensability
出国 Abroadn. 不可缺少, 责无旁贷
✅ 同义词
🗣️ 情景例句
The whole house needs re-painting.
整个房间需要重新粉刷。
If you have time,will you call me tomorrow?
如果你有时间，你明天将打电话给我？
I read a few lines, but I did not understand a word.
我读了几行，但一个字也不懂。