Method 1:
Let's put thousands of fresh ones in cold water, and then put some ice cubes in cold water, but don't freeze them.
Method 2:
Thousands of raw sheets are usually frozen with water. Remember that the water must be salt water, and the water should be changed every day, and it can be preserved by boiling in plain water.
Method 3:
We put thousands of unused sheets in clear water, then put them in the refrigerator and cover them with plastic wrap, which can be kept for 1~3 days.