上联：

to china for china,china with china,

dinner on chi- na;

译为：去中国买瓷器，中国有瓷器，吃饭靠瓷器。

下联：

buys the front door to the front door,

the front door does not have the front door,

the back door has the front door.

译为：到前门买前门，前门没前门，后门有前门。

注：

第一个“前门”是指前门，后面“前门”是指“大前门牌香烟”。