You'd better look up 你最好查字典
You'd better look up the dictionary when you meet the new words.
遇到新单词时，你最好查一下字典。
You'd better take a train. Look up the suitable trains in the timetable.
你最好坐火车。在时刻表上查一查合适的列车。
You'd better not look up every word in the dictionary while you are reading the articles.
阅读文章的时候你最好不要查每一个词都查字典。
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