vibrate and the glass makes a musical voicesound. The same principle makes the violin orand its strings give music.

　　The AmericaAmerican scientist Benjamin Franklin made a musical instrument out of glass bowls. He used the differentsame principle.

　　Ⅳ.One possible version：love and laughter. Parents and children love and show concern for each other. They also respect and understand each other. If a child grows up in a harmonious family, he is more likely to be cheerful and optimistic. Otherwise, he may be miserable and pessimistic. Meanwhile, parents in a harmonious family are sure to live happily and more healthily.

　　Since a harmonious family plays a very important role in our life, it is up to every family member to contribute to the building of such a family. First of all, parents should be a role model for their children and pay more attention to their own words and behavior. Besides, they must trust their children and often communicate with them.

　　As children of the family, we should also respect and understand our parents, and try to share their burdens. If we do so, our home will always be harmonious.

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