科研之友
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<正>In many places of China nowadays,if you leave your house without your wallet,you’ll really be in trouble all day. There is no way to pay for food,transportation or any of life’s other necessities.But in most of the China’s big cities,you can also manage yourself easily without carrying cash or credit cards—as long as you (get)a smart phone!When I lived in the United States,I didn’t often pay cash but I
