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有一个孩子长大了,他告别父母去外地求学。每次给父母打电话,他总要接通两次,第一次响两三声就挂断,第二次才开始通话。
A child grew up, he bid farewell to his parents to study abroad. Each time he calls his parents, he always has to switch on twice, and for the first time, he hangs up for two or three times and starts the call for the second time.