pick on sb
(a) choose sb (esp repeatedly) for punishment, criticism or blame 选中某人(尤指屡次)惩罚、 批评或责怪
She felt that her parents were picking on her. 她觉得父母老是偏偏责备她.
(b) choose sb for a task, esp an unpleasant one 选中某人做某事(尤指厌恶的事)
I was picked on to announce the bad news. 偏偏选中我去宣布这个坏消息.
Snakes did not acquire their poison for use against man but for use against prey such as rats and mice, and the effects on these of viperine poison is almost immediate.