英语词汇retraction ring怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

单词	retraction ring
释义	retraction ring 美/ r??tr?k?n r?? / 简明释义收缩环，子宫收缩环双语例句 1 A mechanical component with two rings pivoted on axes at right angles to each other allowing movement in two directions used in the flap extension and retraction system. 襟翼的伸出和收上系统内的具有两个圆环的机械部件。两个圆环的旋转轴相互垂直，以使部件在两个方向都能转动。
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