translation.en: You lay down a couple of very simple rules -- always cut away from your body, keep the blade sharp, never force it -- and these are things kids can understand and practice with.
translation.zh: 你只需要定下几个非常简单的规定， 诸如不要把刀口对向自己的身体，保持刀的锋利，不要对它施加强力等等。 这些规定都很易于孩子们理解和掌握。