illegal activities (n)
crime /kraɪm/ --> A knife was found at the scene of the crime.
of two or more people or groups (adj)
mutual /ˈmjuː.tʃu.əl/ --> We know each other from a mutual friend.
facts, information, documents, etc. that give reason to believe that something is true (n)
evidence /ˈev.ə.dəns/
protection of a person, building, organization, or country against threats such as crime (n)
security /səˈkjʊr.ə.t̬i/ --> The station was closed for two hours because of a security alert.
send out messages using radio, television (v)
transmit /trænsˈmɪt/ --> The information is transmitted electronically to the central computer.
to notice something that is partly hidden or not clear (v)
detect /dɪˈtekt/ --> dò ra, phát hiện --> Some sounds cannot be detected by the human ear.
to watch and check a situation carefully for a period of time in order to discover something about it (v)
monitor /ˈmɒn.ɪ.tər/ --> kiểm tra, theo dõi