能量守恆定律 [ㄋㄥˊ ㄌㄧㄤˋ ㄕㄡˇ ㄏㄥˊ ㄉㄧㄥˋ ㄌㄩˋ; neng2 liang4 shou3 heng2 ding4 lu:4] the law of conservation of energy ◄ ►