mountain daylight saving time山区夏令时
pacific daylight saving time太平洋夏令时太平洋夏令时
double daylight saving time双夏令时
N-UNCOUNT（不可数名词） Daylight saving time is a period of time in the summer when the clocks are set one hour forward, so that people can have extra light in the evening. 夏令时间 [美国英语]