sliding scale
【机械工程，照明，加热，武器，爆破】滑动齿轮装置，基架齿轮
sliding gear mechanism and gearing, pedestal gearing
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相关词条
sliding-scale basis
sliding scale price
lateral sliding flap
ground sliding, ball hooting
ironing press with sliding tables
up-and-over door (sliding up-and-over door)
vertically sliding wing (vertically sliding sash)