detect
/dɪˈtekt; dɪ`tɛkt/ v[Tn]
(a) discover or recognize that (sth) is present 发现、 察觉或查出（某事物）
The dentist could detect no decay in her teeth. 牙医检查了她的牙, 未见有龋齿.
instruments that can detect minute amounts of radiation 能检测极微量辐射的仪器
Do I detect a note of irony in your voice? 听起来你是在说反话吧?
(b) investigate and solve (crime, etc) 侦察, 侦查（罪案等）
This police officer's job is to detect fraud. 这位警官负责侦查欺诈案.