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？