cut fractiondistillate cutdistillation cutfraction of distillate重馏分;尾馏分: heavy ends; heavy fraction部分;馏分: fraction侧馏分: offstream; side-cut distillate; side-draw初馏分: distil overhead; first cut; light boilers; light ends; starting fraction; top顶馏分: tops下载手机词典可随时随地查词查翻译