有效；生效；在实施中在有效期中／实际上；事实上有效；生效；在实施中

mighty force and civilized force

percentage non-proportional elongation at maximum force【材】

concurrent force【力】;forces acting at the same point【力】

suction force, suction tension

null-force system【物】

attractive force

viscous force

intermolecular force