VOA慢速英语:Smart Home Camera Recognizes Faces

alert – v. to give (someone) important information about a possible problem, danger, etc.; to warn (someone)

facial recognition – n. the ability to recognize different faces

vibrate – v. to move a device back and forth or from side to side with very short, quick movements

adjustment – n. a small change that improves something or makes it work better

flat – n. (Chiefly British, European) an apartment typically on one floor

app – n. abbreviation for “application,” a computer program that performs a particular task (such as word processing)

forbidden – adj. not permitted or allowed

frozen – adj. to become unable to do or say anything

stupefy – v. to shock or surprise (someone) very much; to cause (someone) to become confused or unable to think clearly

intruder – n. a person who enters a place illegally