澳大利亚、美国、西撒哈拉及奥士群岛等许多国家都发行过协力自行车邮票(见附图)。 可供二人或二人以上共同骑行的自行车称之为协力自行车。它一般有二个或二个以上的鞍座、车把和脚踏。 上海凤凰自行车公司曾在’98凤凰杯上海市中学生“看国企改革,爱中华名牌”暑期考察活动中,生产过“飞鸟族”双人双座协力自行车,倍受 Many countries such as Australia, the United States, the Western Sahara and the Osh Islands issue biking stamps (see photo). Bicycles that can be used by two or more people to ride together are called as bicycles. It generally has two or more saddles, handlebars and pedals. Shanghai Phoenix Bike Co., Ltd. had produced double-seat, double-seated, double-decker bicycle in Shanghai ’98 Fenghuang Cup Shanghai High School Students’ Look at Reform of State-owned Enterprises and Love of Chinese Famous Brand in Summer Expedition