A hydroelectric system makes electricity from moving water. A river is held by a dam; the water falls and turns big wheels; those wheels drive machines that make electric current. The river keeps running, so people call this renewable, but building the dam changes the land and the fish — the tidy “clean and simple” story is tidier than the real place.

A hydroelectric system makes electricity from moving waterhydroelectric系統利用流動的水發電 A river is held by a dam一條河被水壩擋住 the water falls and turns big wheels水往下落、轉動大型的水輪 those wheels drive machines that make electric current這些水輪帶動機器產生電流 The river keeps running河水持續流動 so people call this renewable所以大家稱它是可再生能源 but building the dam changes the land and the fish但蓋水壩會改變土地和魚類的生態 the tidy "clean and simple" story is tidier than the real place「乾淨又簡單」這個說法，比實際狀況乾淨俐落多了

The word is an adjective: a hydroelectric dam, hydroelectric power, a hydroelectric plant. Some countries shorten it in speech to hydro.

The word is an adjective這個字是形容詞 a hydroelectric dam, hydroelectric power, a hydroelectric plant像hydroelectric dam（水力發電水壩）、hydroelectric power（水力發電）、a hydroelectric plant（水力發電廠） Some countries shorten it in speech to hydro有些地方口語會簡稱hydro

It is not the same as hydraulic. Hydraulic is liquid pressure doing mechanical work (often with oil). Hydroelectric is water making electricity.

It is not the same as hydraulic它跟hydraulic不一樣 Hydraulic is liquid pressure doing mechanical work液壓hydraulic是靠液體壓力做機械功 (often with oil)常常是用油 Hydroelectric is water making electricityhydroelectric則是水發電