look up

look up 查阅，查检，抬头往上看

【例句】

◆ Looking up every new word will certainly be a waste of time．查阅所有的生词当然会浪费时间。（牛津版，必修③，Unit 2） 

◆ He looked up and found many birds flying in the sky．他抬头看，发现许多鸟儿在空中飞翔。