始质 始质的英文 英语翻译 archyl; prothyl; protyl; psychoplasm 拓展翻译 时效期间的开始commencement of the limitation period始begin始爆剂primer-detonator始代数initial algebra始点beginning point始点斜率starting slope始动发动机starting engine始动机starting engine始动机理starting mechanism始动继电器initialing relay始动转矩starting torque始动阻力starting resistance始端顶点initial vertex始发originating始发爆管primer-detonator始发爆器primer-detonator始发端originating terminal始发港port of departure始发交换机originating exchange始发用户代理originating user agent