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这个开口环是用来连接链条两头的。
The opened link is used to join the two ends of the chain.
《柯林斯英汉双解大词典》
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把手也有大环，小环，甚至开口环等等。
Handle can be a big ring, small ring, or even the openings.
youdao
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把手也有大环，小环，甚至开口环等等。
Handle can be a big ring, small ring, or even the openings.
youdao