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单词	pitch point
释义	pitch point noun : the point of contact of the pitch lines of two gears or of a rack and pinion when in mesh Word History Etymology pitch entry 4
随便看	rip up Rip van Winkle rip-off rip-offs rip-roaring rip-roarious ripariae riparian riparian right riparians riparias riparious ripcords ripe ripe for abuse ripe old age ripe rot ripe with riped ripelier ripeliest ripely ripen ripened ripener

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