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সর্ব-শেষ হাল-নাগাদ: ৩rd অক্টোবর ২০১৬

টানেল

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tunnel is an underground or underwater passageway, dug through the surrounding soil/earth/rock and enclosed except for entrance and exit, commonly at each end. A pipeline is not a tunnel, though some recent tunnelshave used immersed tube construction techniques rather than traditional tunnel boring methods.

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