lostadj.迷路的；丢失的；错过的；失败的；不知所措的；摧毁的；被杀死的；忘我的；不能理解的动词lose的过去式和过去分词形式lost art失传的艺术

1. His plane was lost track of about two hours out from London Airport.
   他的飞机飞出伦敦机场已约有两个小时没有音信了。
2. It's hard to keep track of all one's old school friends. I have lost track of some of mine already.
   很难保持与所有老同学的联系，我已失去与一些老同学的联系了。