改变这些杆的相对长度，这种四杆连杆机构就成为一种实用的机械装置，可以把等速转动转变为非等速转动，或者把连续转动转变成振荡运动。
With various relative lengths of the links, this four-bar linkage becomes a useful mechanism for converting uniform rotary to non-uniform rotary motion or continuous rotary to oscillatory motion.
射流振荡气波制冷机的突出优点是无需输入外加能量并且没有转动部件，只需简单的静密封。
The prominent advantage of this facility is that it doesn't need extra energy supply and there is no moving part, just a simple static seal.
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