at first, at last, at midnight, at night, at nightfall, at noon, at present, at six clock, at sunrise, at sunset,
at that moment, at that time, at the age of, at the beginning of , at the correct time,
at the end of, at the last minute, at the moment,
at the present stage at the same time, at the stage(眼下) at the start, at the time being,
at the time of, at the very start, at this point(此时), at this season,
at this time of day, at times(有时)