tandem tin-plate mill

例句：

1. 1. They rode tandems toschool every day.
   他们每天骑着双轮车去上学。
2. 2. The tandem was agreat way to explore the countryside.
   这辆双轮车是探索乡村的好方法。
3. 3.The tandem is a popular choice forthose who want to save money on transportation.
   双轮车是那些想节省交通费用的人的热门选择。