1.pick off：采摘
We had to pick off the fruit from the tree.
我们必须从树上摘下果实.
2.cut off：切断,中断
Suddenly they found their retreat cut off.
他们突然发现退路已被切断.
3.cut down：砍倒、削减
The trees were cut down .
树被砍倒了.
The U.S.will cut down its financial aid to Korea.
美国将削减对韩国的经济援助.
4.cut up：切碎、抨击
He cut up the meat on his plate.
他在盘子里把肉切成小块.
The film was severely cut up by many reviewers.
这部电影受到许多评论者的严厉批评.