"Book fair" is the Engpsh term for a event where books are sold and displayed. The phrase "book fair" is composed of two words, "book" and "fair", where "book" refers to a collection of written or printed sheets of paper bound together into a volume, and "fair" refers to an exhibition, market or event where goods or services are sold or displayed.

来源：book fair 是由两个词组成的， "book" 和 "fair"， "book" 指的是一个由写或印刷的纸张组成的书籍， "fair" 指的是一个展览、市场或活动，在那里出售或展示商品或服务。

例句：

The annual book fair will be held at the convention center next month.
(年度图书展销会将在下个月的会议中心举办。)
I always look forward to the book fairs where I can find rare books.
(我总是期待图书展销会，在那里我可以找到罕见的书籍。)
The book fair attracted thousands of visitors from all over the country.
(这场图书展销会吸引了全国各地的成千上万的游客。)