1, maybe the porcelain dish is of poor quality. After a long time of use, it gradually becomes unstable in a slow collision, and no one touches it, but when the surrounding environment vibrates, it will crack and break by itself.

2. It may be used improperly. Frequent cold and hot changes lead to changes in the internal structure, making it fragile. When the external environment vibrates, the porcelain plate will automatically break.

3. The porcelain plate stored in your house is only placed at a vibration point. There are sources of frequent and strong vibration in the surrounding environment. When it vibrates, the vibration frequency is fixed, and your porcelain plate is just at the vibration point of * * *, and it is shattered by the earthquake over time.