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Tom doesn't have a ping-pong ball.
汤姆没有一个乒乓球。
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It's a ping-pong ball.
这是一个乒乓球。
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For example badminton games volleyball games and ping-pong ball games.
例如羽毛球,排球和乒乓球。
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Does he have a ping-pong ball?
他有一个乒乓球吗?
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Does Tom have a ping-pong ball?
汤姆有一个乒乓球吗?