And I was researching on water purification system, which has a low impact on environment.

我在研究对环境影响小的水净化系统。

These are the first of several planned amphibious structures, some of which house water purification systems and solar collectors.

这些是早期规划中的水陆两用建筑，其中一些安装了净水系统和太阳能收集器。