His first invention was to design luggage that was flat and therefore easy to stack in railway carriages.

他第一个创意是设计一种扁平而易于堆放在火车厢里的行李包。

youdao

His first invention was to design luggage that was flat and therefore easy to stack in railway carriages.

他第一个创意是设计一种扁平而易于堆放在火车厢里的行李包。

youdao