1. Many Namibians are subsistence farmers who live in the arid borderlands. 许多纳米比亚人都是自给自足的农民，居住在干旱的边境地区。
2. Twenty million years ago, Idaho was not the arid place it is now. Rather, it was warm and damp, populated by dense primordial forest. 2000万年前，爱达荷州不像现在这样干旱。确切地说，它那时温暖潮湿，生长着茂密的原始森林。
3. Regularly flowing rivers and streams that originate within arid lands are known as "endogenous". 起源于干旱地区的流动性河流和溪流通常被称为“内源河流”。
4. These rivers and river systems are known as "exogenous" because their sources lie outside the arid zone. 这些河流和河川系统被称作“外源河流”，因为它们的源头位于干旱地区之外。
5. Some amphibians adapt to arid environments by completing accelerated development with resting stages deep underground. 一些两栖动物通过在地下深处的休眠期内完成加速发育以适应干旱环境。
