词汇	hard formation
释义	hard formation 硬层
随便看	derivative type derivative-type derivative ultraviolet spectrometry derivative unit derivative uses of decorative derivative value derivative value chain derivative variety derivative vector invariant derivative verb derivative vohammetry Derivative voltammerty derivative voltammetry derivative warrant derivative weave derivative weaves derivative weld derivative word derivative work derivative work right derivative work rights derivative works Derivative works are far more complicated derivativity derived audio equipment