pick someone/something off
phrasal verb with pick verb uk/pɪk/ us/pɪk/
(SHOOT)
（有选择地）瞄准射中
to shoot at one particular person, animal, or vehicle that you have chosen from a group
The snipers picked the soldiers off one by one as they ran for cover. 士兵们慌忙走避时，狙击手们将他们逐个击毙。
(TAKE THE BEST)
UK挑选最佳的人选（或物件）
to take the best person or thing from a group
It is relatively easy for newcomers to pick off the most lucrative business and ignore the rest. 新来人员较易挑选最有利润的业务而忽略其他业务。