它是一本英语字典用英语怎么说

"It" 指的是 "一本英语字典"。可以用英文说成 "It is an English dictionary."

"字典" (dictionary) 来源于拉丁语 "dictionarius"，意为 "词汇表" 或 "词典"。

例句：

I always keep a dictionary nearby when I'm reading in English. (我在读英文的时候总是把字典放在旁边。)
Can you please pass me the dictionary? (你能把字典给我吗？)
She's always consulting a dictionary to improve her vocabulary. (她总是查字典来提高词汇量。)