converting day造句

Pullman believed that if his sleeper cars were to be successful, he needed to provide a wide variety of services to travelers : collecting tickets, selling berths, dispatching wires, fetching sandwiches, mending torn trousers, converting day coaches into sleepers, etc . Pullman believed that former house slaves of the plantation South had the right combination of training to serve the businessmen who would patronize his " Palace Cars . " Pullman became the biggest single employer of African Americans in post-Civil War America.
It's difficult to find converting day in a sentence. 用converting day造句挺难的