forward,forward gear是什么意思

用法例句

The results show that the probe wipes the material from the advancing side into a rotating and moving zone, and material rotates, advances, and descends helically in the stir zone and rises in the outer part of the rotating zone.

试验结果表明 ,搅拌头首先搅动前进面的材料 ,使它们进入围绕搅拌头旋转和移动的区域 ;旋转区域的材料运动成螺旋状 ,在搅拌头的活动区域 ,材料旋转、前进、下降 ,而在旋转区域之外 ,材料向上运动。