look up的意思是：向上看；改善;拜訪（某人）；查找。
例句:
1、He looked up from his newspaper(他停止看報紙，把頭擡了起來。)
從…上擡頭看
例句:
2、Things are looking up for us(事情正在朝著對我們有利的方向發展。)
例句:
3、If you don't know a word，look it up in the dictionary(妳要是不認識某個單詞就查查詞典。)
例句：
4、I looked the company up on the Internet(我在因特網上找到了這家公司。)