本期内容：

A giant 3D printer built two houses in an impoverished, rural part of Mexico last week, breaking ground on what will be the first 3D-printed neighborhood in the world.
The houses aren't just a prototype. Developers hope to build 50 new houses by the end of 2020, replacing the structures that residents built themselves out of wood, metal and whatever materials they could afford.
impoverished adj. 贫困的（poor）
rural adj. 乡村的
break (new) ground: 开创，创新
• His latest movie will definitely break new ground.
他的最新电影肯定会开创新纪录。
prototype n. 原型（model）
• a prototype of a new car: 新型轿车的原型
out of: 由……制成；脱离……；出于……
afford vt. 负担；有时间（做某事）
• She couldn't afford the time off work to go back to hometown.
她工作太忙，没时间回家。



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