warn sb about警告某人某事

warn people about fire警告人们火灾

warn sb about doing警告某人不要做某事

warn sb about sth警告某人关于某事;提醒…要注意;告诫某人某事;提醒要注意

warn sb about doing sth警告某人做某事

warn her about her schoolwork告诫她注意她的功课

warn him about his schoolwork关于他的学业警告他

Warn about missing libraries缺少类库时发出警告

Warn about invalid site certificates启用这个设置之;选中