当这个年轻人的生意越做越大，以致于无法再徒步沿街叫卖时，他购得当地牛奶卡车的递送服务，并且开始使用临时代用的邮购目录。
When the young man's business got too big for him to peddle1 on foot, he obtained the delivery services of the local milk truck and started a makeshift2 mail-order catalogue.
无人机可以让我们看到无法亲身观察的事物，也可以把货物递送到遥远或危险的地方。
Drones can let us see things we otherwise could not view and deliver goods to remote or dangerous areas. They can fight fires.
当这个年轻人的生意越做越大，以致于无法再徒步沿街叫卖时，他购得当地牛奶卡车的递送服务，并且开始使用临时代用的邮购目录。
When the young man's business got too big for him to peddle on foot, he obtained the delivery services of the local milk truck and started a makeshift mail-order catalogue.
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