该地区正经历淡水短缺。

The region is experiencing a ___scarcity of fresh water.

经济适用房的短缺推高了租金价格。

A ___scarcity of affordable housing has driven up rental prices.

熟练工人的短缺是该行业面临的主要挑战。

The ___scarcity of skilled workers is a major challenge for the industry.