Did you know, for example, that the backpacks that so many students carry today were originally designed for the military?
比如，你知道现在这么多学生背着的背包最初是为军队设计的吗？
Did you know, for example, that the backpacks that so many students carry today were originally designed for the military?
比如，你知道现在这么多学生背着的背包最初是为军队设计的吗？
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