They offer airline postcards on the plane and they'll post them free.

他们在机上供应航空明信片，而且邮票是不用钱的。

youdao

You are welcome to post them on your site for comparison purposes.

欢迎您，请先他们对你的网站作比较。

youdao

You are welcome to post them on your site for comparison purposes.

欢迎您，请先他们对你的网站作比较。

youdao