How to knock watermelon?

1, first flick the surface of watermelon with your fingers, or pat watermelon with your palm.

2. Secondly, if the voice is voiced, it means that the watermelon is ripe and the flesh is full. If the sound quality is crisp, it means watermelon or raw melon.

3. Finally, feel the weight. Lighter watermelons are ripe melons, while heavier watermelons are raw melons.

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