开刀钮：在被用做开刀钮的同时也是刀子的止刀柱。

The thumb lug: Is used for opening the knife blade as well as serving as the stop pin .

youdao

开合这三把刀可以用拇指柱来完成。

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

youdao

开合这三把刀可以用拇指柱来完成。

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

youdao