Perfect obligation
[法] 合法的债务, 具有完备手续的债务
🧩 词语组成解析
🗣️ 情景例句
Don't be lazy, the older you get, the harder it will be to learn.
别偷懒，年纪越大，学起来就越难。
I could swear I've been here before.
我敢发誓我曾经来过这儿。
You mustn't come home late.You must be home at half past ten.
你不准回家太晚，你必须在10点半到家。