Polychlorohydrocarbon

多氯代烴

??? 情景例句

This is fun. It's a piece of cake.
有意思 毫不費(fèi)力。
A good horse oft needs a good spur.
好馬常需好靴刺。
Which one is cheap? Which one is dear?
哪一支便宜?哪一支貴?
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