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We change our clocks twice per year.
我们每年会调整两次时钟。
In springtime, they spring forward by 1 hour, and that happens on the last Sunday in March.
在春天会向前调一个小时，时间是在三月的最后一个星期天。
While in Autumn, they fall back by an hour on the last Sunday in October.
而在秋天，在十月的最后一个星期天，会向后调一个小时。
But unless you have a clock like this in your house, you might not even realize it's happened.
但除非你家里有一个这样的时钟，否则你可能都没有意识到这件事发生了。
And that's because most digital devices, like phones, tablets and computers, will change to the new time automatically.
这是因为大多数数字设备，如手机、平板电脑和电脑，会自动切换到新的时间。
And as the clocks change at 1:00 a.m. when most of us are in bed, we generally don't even notice the time changing at all, unless you have to get up super early.
时钟会在凌晨1点改变，那时我们大多数人都在床上睡觉呢，除非你早起，否则我们通常都不会注意到时间的变化。
The whole reason this happens is to be able to have the maximum amount of daylight as possible.
发生这种情况的主要原因是为了获得尽可能多的日光。
The March time change means there's more daylight in the evenings and it's darker in the mornings.
三月时调整时钟，意味着晚上更亮，早晨更暗。
While in October, it means it's brighter in the morning, but sunset comes 1 hour earlier in the evening.
而在10月，则意味着早晨更亮，但晚上的日落要提前一个小时。
Now, this system was introduced in 1916 to give people who do most of their work outside, like farmers, as much sunlight as possible to work in.
这个系统是在1916年引入的，目的是给那些在户外工作的人，比如农民，提供尽可能多的日光。
The idea of the time changing has been around for centuries. It's thought that even the Romans did it, too.
调整时间的观念已经存在了几个世纪。据说罗马人也这么做过。
But do we still need it? Some experts say it upsets people's sleep schedules and fewer people work outdoors, so it's not needed.
但我们现在还需要这么做吗？一些专家表示，这会扰乱人们的睡眠规律，而且在户外工作的人也越来越少，所以这么做已经没什么必要了。
The UK isn't the only place to change the clocks, it's something that takes place in more than 70 countries all around the world.
英国并不是唯一一个调整时钟的地方，全世界有70多个国家都在这么做。
Okay, I think it's time for me to go.
好了，我想我是时候该走了。
