1.Having a roof over your head is a basic human need.
a roof over your head 住所;栖身之所
The most important thing in life is to have a roof over your head.
人这一辈子有地方住才是大事 。
2.Two companies have joined forces to try and ease homelessness around the world by building affordable homes using 3D printing.
affordable 负担得起的
Our second goal is high quality, affordable health care for all Americans.
我们的第二个目标是,让所有的美国人享有高质量、支付得起的医疗保健服务 。