Breakdown of Стоило датчику сработать, как пожарные ответили на вызов.
на
on, at / by (transport) / to (a place) / to (in answer to)
ответить
to answer (perfective)
как
than (in 'no sooner ... than')
датчик
sensor
стоить
one had only to (as soon as)
пожарный
firefighter
вызов
call
сработать
to go off
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