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.
用拇指和食指抓住柱,离划痕处越近越好。
Grasp the column between the thumb and forefinger as close to the score point as possible.
用拇指和食指抓住柱,离划痕处越近越好。
Grasp the column between the thumb and forefinger as close to the score point as possible.
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