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?
从比喻的角度来看，“壳”就是他们在汽车上背着的一个个包，堆的各种电线、光盘、数码密钥、电池、各种插头和纸面文件(以防光盘失效)。
In the metaphorical sense, the shell might be a "carry-on" bag on wheels, stuffed full of cables, discs, dongles, batteries, plugs and paper documents (just in case of disc failure).
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.
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