单语范例（未经PONS编辑处理）
The act also established daylight saving time, itself a contentious idea.
en.wikipedia.org During summer (see below for exact dates) daylight saving time is observed and clocks are advanced one hour.
en.wikipedia.org Since 1974, after the 1973 oil crisis, daylight saving time has been observed every year.
en.wikipedia.org There is no daylight saving time, though its introduction has been debated several times.
en.wikipedia.org Voters also decided upon the adoption of daylight saving time, in the province's fifth plebiscite.
en.wikipedia.org