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    Sometimes we wish we could stop time and go back in time. Well, twice a year, some countries actually decide to1the time.

    As summer begins, some countries, like the US, UK and most of other countries in the EU, move the time forward one hour: 12 o'clock becomes 1 o'clock. This is to give people one more hour of 2 This is called “daylight saving time (夏令时时间)”.

    But as winter arrives, you'll notice the darkness stays with us3. The sun doesn't enjoy being out as often as in the summer. To deal with this, these countries turn the clocks4one hour: 1 o'clock goes back to 12 o'clock.

    Countries have done this for about 100 years. At some point, most of the world has tested with it. In fact, from 1986 to 1991, China used daylight saving time.

    By having another hour of sunlight, you can save5by not needing to turn the lights on. Also, it can help the economy (经济), as people enjoy shopping when it is brighter. But people think it disrupts (打乱) sleeping habits. And because mornings are darker, the6of people getting to work and school is a problem.