| 例句 |
on guardphrase paying close attention usually for the purpose of anticipating approaching danger or opportunitySince it was hunting season, we wore brightly colored vests and remained on guard while hiking. alert, Argus-eyed, attentive, awake, observant, open-eyed, tenty(also tentie, Scottish), vigilant, watchful, wide-awake alive, aware, conscious, sensitivecognizant, heedful, keen, mindful, observing, regardful, sharp, sharp-eyedhyperalert, hypervigilant, sleepless, wakefulcareful, cautious, chary, waryprepared, ready on one's toes, on the alert, on the ball, on the qui vive, on tiptoe asleep absent, absentminded, absorbed, abstracted, daydreaming, dazed, distracted, dreaming, dreamy, engrossed, faraway, insensible, oblivious, preoccupiedsleeping, unaware, unconscious, unknowing, unwittingcareless, heedless, inattentive, unheeding, unmindful, unthinking, unwaryunprepared, unready |