The group meets every month to exchange their views on a book they have all read.

exchange 是动词，意思是"交换、交流"，指双方互相给予或分享某物。 views 是名词 view 的复数形式，view 本义是"看、视野"，引申为"观点、看法"。 exchange views 的意思是"交换意见、交流看法"，指互相分享各自的观点。