Put the bread in the microwave oven, sprinkle with water to avoid baking it too dry, cover it and heat it in the microwave oven for 20 seconds. Note: Heating bread will harden, indicating overheating. If heating is continued, the bread will burn and turn into charcoal within 1 minute. You can heat it with high fire, open the door of the microwave oven after 8 seconds, and grope for the heat by hand until it is heated to the desired heat. In the meantime, the oven door can be opened without waiting for the switch to automatically close at the set time. When heating, the tray of the microwave oven will rotate by itself to ensure that the heated bread is heated evenly. Microwave ovens have three grades: small fire, medium fire and big fire. If the bread is heated with high fire, it takes 13 seconds, and it takes 23 seconds with medium fire. The bread itself has been baked in the oven, and the water content is less than that before baking.