Alternative energy sources can be used without running out.
替代能源不会耗尽。
Some examples of the alternatives are solar energy, wind energy and hydroelectricity.
一些可再生的能源例如有太阳能、风能和水电。
As people are becoming more aware of the need to protect the environment, these types of energy are becoming more and more popular.
当人们变得更加关注保护环境时，此类能源正变得日益受欢迎。
Solar energy uses the sun to provide heat, light, hot water and electricity.
太阳能用太阳来提供热、光、热水和电。
The most common way to gather solar energy is to use a complex system of mirrors, pipes and a storage tank.
收集太阳能的最普通的方法就是通过使用一个包括镜子、管子和储能槽的复杂系统。
The solar radiation shines onto the mirrors and heats them as well as the pipes below them.
太阳照射到镜子上，加热镜子以及镜子下面的管子。
The pipes have oil or water inside them, which is heated and sent to the storage tank until needed or used to produce electricity.
管子里有油或者水，加热后被送到储能槽里储存到需用时，亦或被用来发电。
In the past, wind power were used to pump water and make flour from grains.
过去，风能被用来抽水和磨面粉。
Today, wind power is used to produce electricity.
今天，风能被用来发电。
Wind power units are placed at least thirty metres above the ground, where there is a lot of wind.
风能装置被安装在地面以上至少30米的地方，在那里风力很大。