These goods must be kept cool and dry.
这些货物必须保持低温、干燥。
It's so cool here in summer, it must be even colder in winter.
这里夏天都这么凉，冬天岂不是更冷吗？
Milk must be kept in a cool place, or else it will go sour.
牛奶要放在阴凉地方，否则会发酸。
Milk must be kept in a cool place, or else it will go sour.
牛奶如果不存放在阴凉处，很快就会坏了。
Milk must be kept in a cool place, or else it will go sour easily.
牛奶要放在阴凉的地方，否则就容易变酸。
Coolant water or some other coolant must be used to cool most diamond blades.
冷却水或其它冷却液必须用来为最冷锯切。
But, when be cool down, I must admit, we are not happy at most time.
然而，冷静下来，我不得不承认，我们很多时候是不快乐的。
But, when be cool down, I must admit, we are not happy at most time.
然而，冷静下来，我不得不承认，我们很多时候是不快乐的。
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