七项质量管理原则:Tell about atime when you didn't do as well as you should have.这是什么意思？

Tell about atime when you didn't do as well as you should have.这是什么意思？ tell me all about it tell sb something 还是tell sb about something? tell me what you think about this tell me sth about Rocky Grey!!! Tell me something about Germany Sheferd Dog Tell me about it 的歌词谢谢 tell me all about it MP3格式 谁懂演艺圈??Tell me somgthing about it! Who can tell me something about the Yellow Crane tower?