He had, however, published books on several other subjects, including an exhaustive study of barnacles, both living and extinct.
(然而,在其他领域他出版了好几本书,其中包括关于现存的以及灭绝的藤壶的详尽研究)之后,在那年的六月,达尔文收了一个名叫阿尔弗莱德.鲁塞尔.华莱士的年轻人的包裹。
Most books are intended to be easily read and understood, and the oldest ones can often serve as windows into long-extinct cultures and ways of life.
大多数的书都容易阅读、理解,而古老的书籍则是认识早已灭绝的文化和生活方式的一扇窗。