单词	olefin series
释义	olefin series = ethylene series
随便看	Itsutsuna Itsutsuno Itsuya Itsuyama Itsuyasu Itsuyo Itsuyori Itsuyoshi Itsuyuki It s very hot today Its Very Kind of Him Its very seldom that I reply anything ya Its very seldom that I reply anything ya? Its voice has been paternalistic Its voice was little Its voice was little,and seemed to shiver Its voice was little, and seemed to shiver Its voltage has not been exceeded its wark it's water under the bridge Its where you oughta stay Its whir is drowned in her deep sigh Its windmill compresses air directly its wings whirring It switches itself on automatically