Fast, cheap and convenient, E-mail is so popular that it has become an indispensable means of communication.

它快速、便宜、方便、电子邮件如此的流行以致于它已经变成了一种必不可少的交流方式。

youdao

Fast, cheap and convenient, E-mail is so popular that it has become an indispensable means of communication.

它快速、便宜、方便、电子邮件如此的流行以致于它已经变成了一种必不可少的交流方式。

youdao