2, in each cut to the time to put the knife clean, and then from the tip of the knife with a little bit of water to let the water run down the blade.
3, cut when the hand holding the knife is not almost no force, just follow the knife itself a little weight, a little force.
4, the use of sawing second cut.
5, cut to the root is still left a little bit not broken when the hand to press down a little broken (because seaweed in water will have a kind of toughness)