third gear forward 前进第三档
first gear forward 前进一档齿轮
forward gear 前进机构 ; 前进档 ; 行进挡
forward gear position 前进档位置
nose gear well looking forward 向前看去的前起落架舱
forward gear assembly 前进档总成
forward gear slot 前进档切口
forward input gear 前进档输入齿轮
forward pinion gear 前进档小齿轮
In this paper calculating method of lead angle of helical gear by measuring span length of length bar and base tangent length is put forward and lead angle calculating formula is deducel.
分析齿轮主要参数，提出用测量跨棒（）和公法线长度计算斜齿圆柱齿轮螺旋角的测绘方法，并推导出螺旋角的计算公式。
Press the button on the gear leaver and slot into d, release the brake and the car creeps forward.
按下波棍上的按钮，把档把划入D档，松下手刹，车子开始慢慢的向前滑动了。
Stop and shift into forward gear to move ahead.
停车并换前进档向前行驶。
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