n.
										 be sb's lookout
										- (认为某人的行为不明智)是某人自己的责任,是某人自己的事
 used to say that you do not think sb's actions are sensible, but that it is their own problem or responsibility.- If he wants to waste his money, that's his lookout.
 他要乱花钱,那是他自己的事。
 
 be on the lookout (for sb/sth)
										 keep a lookout (for sb/sth)
										- 注意;警戒;留心
 to watch carefully for sb/sth in order to avoid danger, etc. or in order to find sth you want- The public should be on the lookout for symptoms of the disease.
 公众应当留心这种疾病的症状。