Once upon a time in as many as the stars, but this is the fate of the gear was open, time reversal in that year, that year, let me enjoy the taste of success and failure is how happy.
往事如星星般多，但是命运的齿轮就这样打开了，时间倒转到了那一年，那一年让我领略到失败与成功的滋味是多么开心。
Dual-piston driven. toothed bar and gear driven, structure is compact, position of assembly is symmetrical. Motion is swift. turning of output axis can be changed through simple reversal of piston.
双活塞推动，齿条齿轮传动，结构紧凑，装配位置对称，动作迅速，通过简单的活塞颠倒可以改变输出轴转向。
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