start at起始于startv.开始；出发；震惊n.开始；震动；领先优势；起推动作用的外力start-up enterprise创业企业starting motor pinion起动机驱动齿轮start-up components起动设备starting air cylinder起动空气瓶starting crank handle起动手摇曲柄starting air silencer起动空气消音器starting own business自主创业型starting lever spring起动杆簧start-stop protocol启停协议starting pulse action启动脉冲作用