"Cut down"是一个及物动词短语,意思是 "砍倒",即将树木或其他物体砍倒。
一般情况下中间不需要加任何东西。例如:- The lumberjack cut down the tree.- The city decided to cut down the old buildings to make room for new development.不过如果是像 "cut down on something"的短语,意思是"减少某物的消耗",那么中间需要加一个 "on"。例如:- I'm trying to cut down on my sugar intake.- He needs to cut down on smoking if he wants to stay healthy.
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