✅ 同义词
🗣️ 情景例句
You must observe these simple rules.
你必须遵守这些简单的规定。
Do you have an appointment?
你有预约吗？
If you touch them you may break something or have an accident and hurt yourselves.
如果你用手摸它们，也许你会搞坏机器，或者会发生事故，打伤你自己。