worn flange
滑轮凸缘磨损 sheave flange wear
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冷却板周边的凸缘的存在，也减小了冷却板的磨损，延长了其使用寿命。
The existence of a flange at the periphery of the cooling plate also reduces the abrasion of the cooling plate, and prolongs the service life of the cooling plate.
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