Obligatio naturalis
[法] 自然债务
🧩 词语组成解析
[法] 债, 债权, 债务
[医]（拉）天然的，自然的
🗣️ 情景例句
Our boss expects us to eat, drink and sleep our job.
我们老板恨不得我们把工作当饭吃，当水喝，当觉睡。
If you want my advice,I don't think you should go.
如果你想要我的忠告，我不认为你应该去。
The question was, which one?
问题是，哪一种气体导致火灾呢？