无论最终商业模型是否成熟，这种模式试验本身，都属于产业进化过程中的重要一环。
"A lot of stately homes will have that system," says Niki Johnson, fire systems technical adviser for the UK Fire Association, a trade body, and owner of fire detection firm Derventio Fire and Security. "You could be looking at £3-4,000 just to do a corridor." Such installations require substantial pipework, he explains.
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An unsatisfiable formula is: