答案对于这一方案能达到这种效果做解释:
A:The fire department traces all alarm calls made from private telephones (解决了警亭的匿名问题)and records wherethey came from(实现了警亭的定位功能).
将警亭的缺陷解决,并且不影响警亭本身的功能,自然可以达到想要的效果。
Evidence1: False alarms are mostly from phone boxes.
Evidence2: Everyone has a phone so the phone box is not useful.
Conclusion1: Removing phone boxes can reduce false alarms.
Conclusion2: People can report a fire without phone boxes.
Evidence2->Conclusion2.
Evidence1->?->Conclusion1? Evidence1+calls from private phones are tracked -> Conclusion1.