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There's a secondary ring here, -and an inner ring.
在这里另有第二圈，另有最内圈。
youdao
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The holding ring and the secondary holing ring are connected through a screw thread.
扣押环与二次扣押环通过螺纹连接。
youdao
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The holding ring and the secondary holing ring are connected through a screw thread.
扣押环与二次扣押环通过螺纹连接。
youdao