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Alternative energy sources can be used without running out.
替代能源不會耗盡。
Some examples of the alternatives are solar energy, wind energy and hydroelectricity.
一些可再生的能源例如有太陽能、風能和水電。
As people are becoming more aware of the need to protect the environment, these types of energy are becoming more and more popular.
當人們變得更加關注保護環境時，此類能源正變得日益受歡迎。
Solar energy uses the sun to provide heat, light, hot water and electricity.
太陽能用太陽來提供熱、光、熱水和電。
The most common way to gather solar energy is to use a complex system of mirrors, pipes and a storage tank.
收集太陽能的最普通的方法就是通過使用一個包括鏡子、管子和儲能槽的復雜系統。
The solar radiation shines onto the mirrors and heats them as well as the pipes below them.
太陽照射到鏡子上，加熱鏡子以及鏡子下面的管子。
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，加熱后被送到儲能槽里儲存到需用時，亦或被用來發電。
In the past, wind power were used to pump water and make flour from grains.
過去，風能被用來抽水和磨面粉。
Today, wind power is used to produce electricity.
今天，風能被用來發電。
Wind power units are placed at least thirty metres above the ground, where there is a lot of wind.
風能裝置被安裝在地面以上至少30米的地方，在那里風力很大。
