keep an eye on

留意，照看

karat, karate, karma, kart, Kashmir, kayak, kazoo, KB, KBE, KC, kebab, kedgeree, keel, keen, keenly, keenness, keep, keep (radio) tuned for, keep (sb/sth) away (from sb/sth), keep a promise, keep at, keep away, keep back, keep clear of, keep company with, keep doing sth., keep down, keep early hours, keep faith, keep friends with, keep from, keep from doing, keep house, keep in mind, keep in touch, keep in touch with, keep off, keep on, keep on good terms, keep one's balance,