他转动着这块仪表板上的一个旋钮。
甚至现代的方法(用这种方法扫描时，被测人员要在一块玻璃板上转动手指)，往往需要对每根指头采集多次，才能获得一个可用的指纹。
Even the modern approach, in which the subject's finger is rolled over a glass plate for scanning, often requires several attempts per finger to get a usable print.
进口蝶阀是指通过阀轴旋转来带动一个圆盘形的蝶板的转动，达到开启与关闭的一种阀门，在管道上主要起切断和节流用。
Butterfly valve through the valve shaft rotation to drive the rotation of a disc-shaped disc, to open and close a valve, cut off from the main pipe and throttle with.
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