I'd like to have a set of Commemorative Stamps.

我要买一套纪念邮票。

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To mark the occasion, the Chinese Post Office issued a set of commemorative stamps.

中国邮局发行了一套邮票来纪念这次活动。

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Last week, they appeared together as the latest faces of a set of commemorative stamps released by the US Postal Service, which was to mark the 20th season of the long-running comedy.

上周，他们一块作为由美国邮政服务部发行的最新纪念邮票出现了，此邮票是为了纪念这部喜剧开播20周年。

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