英语有个阅读篇,要说为什么!在线等~（上）

Question

我看着这英语就头晕．．．．．不是不会．．．．．．．生词太多，还得一个个去查，郁闷啊．．．．．．．好的话追加悬赏分．．．．
Scientists,pilots,and weather forecasters in the United States use a twenty-four hour clock instead of the twenty-four hour clock that most other people use.This clock uses Greenwich Mean Time(GMT)as a starting point. Greenwich Mean Time is the time at Greenwich,England.
To change GMT to local time,we must know the time difference between GMT and local time.As you go east from Greenwich,you add hours to the current GMT .As you go west you subtract hours.In the United States,during the summer,some areas use Daylight Savings Time.In these states,people set their clocks forward one hour so that they can enjoy a longer evening before it gets dark.The abbreviations EDT,CDT and MDT stand for Daylight Savings Time in three parts of the U.S.

What does EST mean?
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What do you think MDT means?
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Answer 1

在美国科学家,飞行员和天气检测员用的是和普通人不一样的24小时制式表.这种表是以格林尼治标准时间做为起点的.格林尼治标准时间英格兰格林威治的时间.
要把格林尼治时间变为本地时间,我们就必须知道格林尼治时间和本地时间的时差是多少.如果你从格林尼治出发往东走,你就需要加上几个小时才能到本地时间.如果你往西走,那么就要减去几个小时.在美国,夏季一些地方用夏令时(日光节约时间),在这些州,人们把时间向前调1个小时,这样他们可以在天黑之前享受更长的黄昏.EDT,CDT和MDT的缩写是代表美国不同的三个地区的日光节约时间.