对联"有志者,事竟成,破釜沉舟,百二秦关终属楚;苦心人,天不负,卧薪尝胆,三千越甲可吞吴"上下联分别给古代哪两位名人有关?()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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