严酷的沙漠环境考验着人类的耐力极限。

The ___harsh desert environment tests the limits of human endurance.

在严酷的北极环境中生活需要专门的生存技能。

Life in the ___harsh Arctic conditions requires specialized survival skills.

严酷的冬季天气迫使我们推迟了徒步旅行。

The ___harsh winter weather forced us to postpone our hiking trip.