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。

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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。

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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。

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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。

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