relatively long in duration; tediously protracted;
"a drawn-out argument"
"an extended discussion"
"a lengthy visit from her mother-in-law"
"a prolonged and bitter struggle"
"protracted negotiations"
drawn out or made longer spatially;
"Picasso's elongated Don Quixote"
"lengthened skirts are fashionable this year"
"the extended airport runways can accommodate larger planes"
"a prolonged black line across the page"
prolonged的用法和样例：
例句
The meeting may be prolonged into the evening because so many problems have to be solved tonight. 会议可能要延长到夜里，因为今晚有太多问题要解决。
After prolonged discussion, the representatives hammered out a form of words that was acceptable to everyone. 代表们经过长时间的讨论之后，终于想出一种大家都能接受的措辞方式。
The crowd burst into prolonged cheering. 人群中爆发出长时间的欢呼声。
After prolonged questioning, she finally confessed. 她受到长时间的盘问之后,终于承认了。
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