平方反比定律 [ㄆㄧㄥˊ ㄈㄤ ㄈㄢˇ ㄅㄧˋ ㄉㄧㄥˋ ㄌㄩˋ; ping2 fang1 fan3 bi4 ding4 lu:4] the inverse square law (in gravitation or electrostatics) ◄ ►