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The humble watermelon. The epitome of summer. But how do you know if it's perfectly ripe? Well, one theory is that if you knock hard on the outside, the sound you hear will help determine if it's ready to eat. 其貌不扬的西瓜象征着夏季。但你怎么确定西瓜是否熟透？有种理论是，用力敲敲西瓜皮，听听声音，这能帮你确定它们是否完全熟了。 That theory lead to a huge online debate in China about what kind of people engaged in the art of 'watermelon knocking'? 这种做法近期在中国的网络上引发热议，大家争相讨论哪些人爱“敲西瓜”。 The discussion, which thousands of people contributed to on the Chinese micro blogging site Sina Weibo, was kicked off by an obscure event thousands of miles away in Italy. 数千人参与了新浪微博上的这次大讨论，而引发这次讨论的是遥远的意大利的一件小事。 | 
