Generally, if the watermelon has been cut and put in the refrigerator, it will not go bad for 4~6 hours, nor can it be put for too long, because it is summer and the temperature is relatively high, even if it is put in the refrigerator, it will rot and deteriorate. Therefore, when you are saving watermelons, you must pay attention. If you can't put watermelons in the refrigerator, don't touch them. If it is more than three days later, it must be handled in time. Otherwise, the broken watermelon will not only breed a lot of bacteria, but also attract many small mosquitoes, and other foods stored in the refrigerator will also suffer. Everyone must pay attention to this. Precautions for putting watermelons in the refrigerator, whether whole or cut into small pieces, will breed "countless" bacteria within 6 hours if they are not protected. Therefore, the storage time of cut watermelons should not exceed 4 hours, and the unprocessed watermelons should be kept as low as possible to ensure their integrity. Watermelon is best placed at the bottom of the refrigerator, where the temperature is about 8- 10 degrees Celsius. This temperature is also the best taste. Do not eat more than 500 grams at a time. Eat slowly.