"The book is thick" 是一种常用的表达方式，它表示这本书很厚。这个短语的来源源于描述书的物理性质，即它的厚度。
例句：
"This novel is thick. It will take me a while to finish reading it." (这本小说很厚，我需要花点时间来读完。)
"I was impressed by the thickness of the book. It must be packed with information." (我对这本书的厚度印象深刻，它一定充满了信息。)
"The dictionary is thick, but its small size makes it easy to carry around." (这本词典很厚，但它的小尺寸使得它很容易携带。)