Metal cock ring soft seat surface pressure to the bearing surfaces, such as the valve core and valve seat is concentric ring surface can be a double tight closure.
金属旋塞表面压向阀座环软支座表面，如阀芯和阀座环表面是同心的，就能得到双重严密的关闭。
When the cock met the hen the next day, he was very surprised to see the ring around her neck.
第二天，当公鸡见到母鸡时，它惊讶于看到她脖子上的戒指。
When the cock met the hen the next day, he was very surprised to see the ring around her neck.
第二天，当公鸡见到母鸡时，它惊讶于看到她脖子上的戒指。
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