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?
在森林徒步旅行时，即使背着摄像机也是件极难的事。
Even carrying the camcorder while hiking in the forest was an effort.
爱德华和艾美特正准备离开，艾美特肩上背着一个看上去很沉的背包。
Edward and Emmett were ready to leave, Emmett carrying a heavy-looking backpack over his shoulder.
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