Initially you can send 5 postcards. As you exchange more postcards with other members of the site, the number of postcards that you can send (that is, have simultaneously traveling) will increase. This system encourages new users to try out the project while allowing more avid members to send more p的翻译：什么意思？中文翻译英文，英文翻译中文，怎么说？

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最初，您可以发送5明信片。为您的交流与网站的其他成员更多的明信片，明信片，您可以发送（即同时行驶）将增加。这一制度，鼓励新用户尝试的项目，同时让更多的狂热的成员发送更多的明信片。