What is a table tennis ball made from?

乒乓球是由什么物质做成的?

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Then he cut a a table - tennis ball into two carefully, and blindfolded her.

然后他很小心地将乒乓球切成两半, 蒙住她的双眼.

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This table - tennis ball has a dent. How can you make it round again?

乒乓球上有个凹陷, 你怎样能使它变回原形?

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