一时 1.(短时间) for a short while; temporary; momentary 一时的热情 a moment's enthusiasm; on the spur of the moment; 一时想不起来 can't recall offhand (for the moment); 一时半会儿 in short while2.(一个时期) a period of time 此一时彼一时。 times have changed. 这首歌曾风行一时。 the song had a great vogue at one time.3.(时而) now... now...: 天气一时冷, 一时热。 the weather is now cold, now hot
彼一时,此一时 That was one situation and this is another -- times have changed.Circumstances alter cases.Different times call for different actions.
此一时,彼一时 This is one situation and that was another. -- Circumstances have changed with the passage of time.The condition at present is very much different from that of the past.Things are now different from what they were.Times have changed.