The condenser behind the refrigerator must keep clean because dust will affect the cooling rate.
柜后的凝结器则要经常清扫，因积在上面的尘埃会妨碍散热。
我们必须保持地球干净整洁！
We must keep sea water clean and stop polluting it.
我们必须有保持海水干净，停止污染。
Everybody must keep your clothes clean.
大家必须保持衣服干净。
我们要保证清洁，禁止污染。
To keep your pet dog clean, you must brush its fur every day.
为了让你的宠物狗保持干净，你必须每天为它刷毛。
You must keep your room clean.
你们必须保持房间干净。
We must keep our classroom clean and tidy.
我们必须保持教室干净整齐。
Keep in mind, though, for this test work, you must make sure that your diamond is completely clean and free from oil or dirt.
需要牢记的是，在做这个测试时，你必须保证你的钻石是完全干净且没有沾染油污或灰尘。
We must keep the classroom clean.
我们应该保持教室干净。
We must keep the classroom clean and tidy.
我们必须保持教室干净整洁。
The earth is our home. We must keep it clean.
地球是我们的家，我们必须使他保持干净。
Some measures must be taken to keep our cities clean.
必须采取某些措施来保持我们城市干净。
We must always keep our classroom clean.
我们应使教室一直保持清洁。
We must pick up rubbish and keep our city clean.
我们必须捡起垃圾，保持城市清洁。
我们必须保持这个房间清洁。
The earth is our home. We must keep the land, air and water clean.
地球是我们的家园，我们必须保持陆地、空气和水的干净。
We must keep our school clean.
我们必须保持我们的学校清洁。
We must keep our classroom clean.
我们必须保持我们的教室干净。
Keep quiet! The baby is sleeping. We must keep our classroom clean.
那婴儿正在睡觉，保持安静！我们必须保持我们的教室干净。
We must keep the land, air and water clean.
我们必须维持土地、空气和水的干净。
You must keep your classroom clean.
你们必须保持教室干净。
Better keep yourself clean and bright; you can be the window through which you must see the world.
还是把自己搞得干净欢快些吧；你是自己看这个世界的窗户。
Better keep yourself clean and bright; you can be the window through which you must see the world.
还是把自己搞得干净欢快些吧；你是自己看这个世界的窗户。
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