First, they let you shop around fore-books at different online bookstores, and many run promotions.

首先，它们允许你在不同的网上书店选购电子书，许多还都有促销优惠。

youdao

First, they let you shop around fore-books at different online bookstores, and many run promotions.

首先，它们允许你在不同的网上书店选购电子书，许多还都有促销优惠。

youdao