Double step drum is an integral drum with stepwise flanges and double step sections. It allows the multiple layer rope winding in non-operating portion of luffing mechanism to make drum shorter.
双阶梯卷筒是一种带有阶梯法兰盘和双阶梯截面的综合式卷筒，可在变幅机构的非工作区段使钢丝绳多层卷绕，以缩短卷筒长度；
They step and kick. They turn and spin. They step and kick again to the sounds of drum and horn.
他们踏眺踢腿， 扭身旋转， 顺着鼓和喇叭的乐声再次踏步踢腿。
The complete vehicle test for a fuel-cell vehicle (FCV) is conducted on running drum tester, in which the working performance of radiator is studied under the step-constant speed condition.
在转鼓试验台架上进行燃料电池汽车的整车试验，利用阶梯等速法研究散热器的工作性能。
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