The disease ping-pongs through the population.
这种疾病在居民中交错传染。
The wife asks: "What do 3 ping-pongs have special significance? "
妻子问：“三只乒乓球有什么特别意义？”
The husband after 30 years opens a drawer, the wife sees 3 ping-pongs and 30 yuan of fund.
妻子答应了。三十年后丈夫打开抽屉，妻子看到三只乒乓球和三十元钱。
Investigation into the Present Condition of Training by Using more Ping-pongs
乒乓球多球训练法的研究现状分析
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