backward gear

基本解释

The cold extrusion of sleeve with special shaped interal gear is experimentally researched. The backward extrusion is substituted by radial extrusion.
对凿岩机异形内齿套筒的冷挤压整体成形进行了试验研究。
The motor drives the back of the press blade to move forward and backward via the gears and gear arm to realize the purpose of punching easily and quickly;
由电机通过齿轮、齿臂带动压刀梁作前后运动，达到冲孔轻松、快捷的目的；
ip.com
The arc gear pump industry downturn, led to our country backward arc gear pump, which is constraining the development of our arc gear pump an important factor.
整个圆弧齿轮泵行业的不景气，导致了我国圆弧齿轮泵产品的落后，这是制约我国圆弧齿轮泵产品发展的重要因素。

Options for the new machines will include Apple's new wireless-networking technology, Airport Extreme, which supports speeds of 54 megabits per second and is also backward-compatible with standard Wi-Fi gear.
FORBES: Magazine Article