must keep clean
必须保持清洁
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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。
youdao
We must keep the earth clean!
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。
The residents, for their part, realized that as landlords, they must keep the neighborhood clean in order to obtain the highest rents from their commercial tenants.
FORBES: Social REITS To Re-house Slums & Regenerate Cities
As long as countries like China keep going all in on clean energy, so must we.
WHITEHOUSE: State of the Union 2013
As long as countries like China keep going all-in on clean energy, so must we.
FORBES: Full Text: President Obama's 2013 State Of The Union Address
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