"两本单词书" 英文说法为 "two dictionaries"。
"dictionary" 来源于拉丁语 "dictionarius"，意为 "词典"。
例句1：I always carry a small dictionary with me when I travel. 我出门旅游总是带着一本小词典。
例句2：I looked up the word in the dictionary, but I still don't understand its meaning. 我在词典里查了这个单词，但是还是不明白它的意思。