The thumb stud is inlayed with a ruby.

拇指图钉与一块红宝石一起嵌入。

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Opening and closing of these three knives is accomplished by a thumb stud.

开合这三把刀可以用拇指柱来完成。

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Opening and closing of these three knives is accomplished by a thumb stud.

开合这三把刀可以用拇指柱来完成。

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