It was a long time before the police caught on to what he was really doing.
过了很久警方才明白过来他究竟在干什么。
Examples from the Corpus
catch on• Thomas isn't catching on as quickly as some of the other children.• She catches onfast and will soon be promoted.• It took Jennifer a long time to catch on to the fact that Mary was taking advantage of her.
catch to• It's not that hard, once you catch on to it.• The film has its roughpatches: particularly the implausiblespeed with which Jeanne catches on to something being amiss with Mika.• But by the second year of high school I caught on to taking the good teachers.• Patientscatch on to the criterion after a short while and soon are hearing a yes after each card.• Ham it up, as much as you like-the children will soon catch on to the fun.• And lots of people have caught on to this.• Then I caught on to what it was the guy was saying.• Perhaps because a psychologist might have caught on to what this was all about-and too soon to suit Hari Seldon.• When Laughton caught on to what was going on, he became paranoid and refused to work.