In this case, you want to restrict the definition of a Pamphlet, which is similar to a Book in every way except that it has no author.

在本例中，希望限制Pamphlet(小册子)的定义，除了没有作者以外，它与Book完全相似。

youdao

These weighty charges were brought because, in a public speech and in a pamphlet, he had criticised Malaysia's police and its attorney general over their conduct of a case involving a 15-year-old girl and a number of men, including a prominent politician.

ECONOMIST: Muzzled in Malaysia