When cold mixing shredded bamboo shoots, shredded bamboo shoots need to be put into the water at Nao 1 The purpose of this is to make shredded bamboo shoots more crisp and refreshing, and to kill bacteria and pests left on the knife and chopping board when cutting vegetables. But some vegetables, such as lettuce, are washed and dehydrated and eaten raw directly. Because if you put it in Nao 1 water, the lettuce will wither and not crisp. In addition, because lettuce 1 does not need to be cut with a knife, it is directly torn by hand, and it does not need to touch a kitchen knife and a chopping board, nor does it need to be sterilized, killed and prevented by hot water.