音标发音英式音标 [ˌnɔː.məl ˈfɔːs]美式音标 [ˌnɔːr.məl ˈfɔːrs]英式发音 美式发音 基本解释正交力,法向力,垂直力。同根派生 英英字典剑桥英英字典 the amount of force that keeps two surfaces touching, but does not let them come apart or press further together