A central force is defined as a force acting along the line joining a particle or object to a center of force . 辏力就是沿着质点（或物体）向力心连接线方向作用的力。
2.
For example , the chinese terms for " central force " , " entropy " and " enthalpy " are so accurately translated with linguistic competence , one could not have figured them out without a profound literary background 例如在物理学里的中心的“辏力” ，热力学里的“熵”和“焓” ，是多么确切而又有韵味，没有好的文学根底是想不出来的。
3.
It had been determined between them , that the old world , with its crowds and cities , offered them a more eligible shelter and concealment than the wilds of new england , or all america , with its alternatives of an indian wigwam , or the few settlements of europeans , scattered thinly along the seaboard 他俩已经商妥，比起只在沿海一带疏落地散布着印第安人的茅屋或欧洲移民聚居区的新英格兰或全美洲的荒野，旧大陆人烟稠密城市辏集，更适合于他们隐蔽或隐居式的生活。
