A vandal with a chainsaw cut down a tree.

　　一個蓄意破壞公物者用鏈鋸鋸倒了一棵樹。

　　You should cut down on fats and carbohydrates.

　　你應該減少攝入脂肪和碳水化合物。

　　The doctor told him to cut down on his drinking.

　　醫生勸他少喝酒。

　　He will now try to cut down the task to a manageable size.

　　他現在將盡力把任務縮減到能應對的程度。

　　We're trying to cut down on the amount of paperwork involved.

　　我們正在努力降低有關此事的文書工作量。