postcrossing

That said, we know of many Postcrossing members, including Chinese, who have actually improved their English skills through their use of Postcrossing.

尽管如此，我们知道许多 Postcrossing 会员，包括中国人，通过使用 Postcrossing 提高了英语技能。

A common language is required and in postcrossing that´s English since it´s widely spoken.

在 Postcrossing 网站上，需要使用一种共同的语言，也就是英语，因为它被广泛使用。

For Postcrossing to work worldwide, a common communication language is needed so that everyone can understand each other.

为了使 Postcrossing 网站能在世界范围内发挥作用，需要一种共同的交流语言，以便大家能够相互理解。