N
a pipe for carrying rainwater from a roof gutter to the ground or to a drain 落水管 (Also called rainwater pipe, drainpipeUsual US and Canadian name downspout)
[英国英语]
The next decade may find 4.3 pedabits per second traveling down that solitary pipe--enough to beam a family reunion in holographic form into every living room in Manhattan.
The first trial run demonstrated that 1 km of high-density polyethylene pipe could be laid down over mountainous terrain and in windy conditions in just nine minutes.