natural process

Passive and Hybrid Downdraught Cooling, which rely on natural cooling processes based on water evaporation and solar power, are now technically viable in many parts of the world.

依靠水蒸发和太阳能的被动及混合倒风制冷技术目前在世界上大部分地方得到了广泛应用。

While some of this can be explained by society—in countries like China baby boys are favoured and many unborn girls are electively aborted—there are natural processes at work.

有时候这种情况可用社会来解释—在中国等国家，男孩比较受欢迎，还未出生的女孩会被选择性地堕胎—不过自然过程也有。