Dust and dirt soon accumulate if a house is not clean regularly.
房屋不经常打扫，尘土很快就越积越多。
If we use something not clean, we may be ill from it.
如果我们使用这些不干净的东西，我们可能会因此而生病。
Keyboards can be a breeding ground for bacteria if not kept clean.
如果不注意清洁，键盘就成了细菌滋生的场所。
If not, please clean it after school. Please tell me.
如果不干净，请你放学后把它洗干净。
If we do not clean our food, it will produce a lot of bacteria.
如果我们不清洁食物，就会有很多细菌。
If you see that they are not clean ask the waiter or waitress for a new one.
如果你发现它们不干净，可以让侍者换新的。
If you see that they are not clean ask the waiter or waitress for a new one.
如果你发现它们不干净，可以让侍者换新的。
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