single out 只有挑出或选出的意思
例子:Which would you single out as the best? 你觉得哪一个最好?
pick out 有多个意思。
挑选出。
分辨出。
凭记忆奏出乐曲。
细心研究后发现或领会某事物。
那要是都表示挑出时有什么区别
追答single out select sb/sth from others ,eg for special attention
pick out : choose sth/sb from a number of people/things