The main knife-edge area is a convex strip-shaped cutting belt, and is used to cut into sheets and threads;

主刀口区是呈凸弧狭条形切割带，用于切片切丝；

youdao

Lord Drummond Young, who heard the appeal with Lady Smith, said Henderson was "the main attacker" who had used a knife.

BBC: David Jones

But the main constraint is the lack of enough people trained to wield the knife cleanly and safely.

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The main effect of the decision is to restrict what had become a sort of Swiss Army knife for prosecutors.

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