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day·light-sav·ing time AHD[dā'līt-sāʹvĭng] D.J.[ˌdeɪlaɪtˈseɪvɪŋ]K.K.[ˌdelaɪtˈsevɪŋ]n.（名词）abbr. DST, D.S.T.【缩写】- Time during which clocks are set one hour or more ahead of standard time to provide more daylight at the end of the working day during late spring, summer, and early fall.夏令时间：把时钟照标准时间调到提前一小时或更多的时间，在春末、夏季和早秋工作日结束时提供更多的日光
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