如果你不知道这个词的意思，就在词典里查一下。

If you don't know what the word means, ___look it ___up in a dictionary.

如果你有不熟悉的单词，可以在词典里查这些单词。

If you have unfamiliar words, you can ___look ___up these words in a dictionary.

我经常在线查找新词汇。

I often ___look ___up new vocabulary online.