连词
中文翻译：除非
同义词：
['if not', 'unless', 'supposing例句：1. You must finish the work before tomorrow unless you have a good reason.（除非你有充分的理由，否则你必须在明天之前完成这项工作。）2. Unless he gets there by tomorrow', 'we will miss our flight.（除非他明天到达，否则我们将错过我们的航班。）3. Unless you pay for it', "I won't give you the keys.（除非你付钱，否则我不会给你钥匙。）"]
例句：
-
1. You must finish the work before tomorrow unless you have a good reason.
除非你有充分的理由，否则你必须在明天之前完成这项工作。
-
2. Unless he gets there by tomorrow, we will miss our flight.
除非他明天到达，否则我们将错过我们的航班。
-
3. Unless you pay for it, I won't give you the keys.
除非你付钱，否则我不会给你钥匙。