hydro-

例句：

1. 1. The hydroelectric power plant is located in the mountains.
   水力发电站在山区。
2. 2. Hydrogen is a lightweight and odorless gas.
   氢气是一种轻且无臭的气体。
3. 3.The study of water is essential for life on Earth.
   研究水对于地球上的生命至关重要。