up是几年级学的|look

look up是八年级学的

基本解释：向上看改善拜访（某人）查找

例句：Third it is very complex to look up the characters in a dictionary .

原因三：即使在字典中查汉字也是非常复杂

Head for the 2600 block of lemoyne avenue and look up .

走向勒莫因大道2600号大楼，抬头看看。