When I began working at Hillcrest High School three years ago, I was introduced to Sharon Dunn, the school's headmistress.
三年前，当我开始在希尔克雷斯特高中工作时，我被介绍给了该校的校长沙伦·邓恩。
These man-made barriers will ensure a very high degree of protection for several hundred years.
这些人造屏障将会确保几百年的高度保护。
Martha graduated from high school two years ago.
玛莎两年前高中毕业。
In the middle to high latitudes rainfall has risen steadily over the last 20-30 years.
中高纬度地区的降雨量在过去的20到30年间稳步上升了。
Only 18.8% of the class of 1982 had some kind of diploma four years after high school, versus 45% of the class of 1972.
相对于1972届学生中有45%在中学毕业4年后获得了某种文凭来说，1982届学生的这一比例只有18.8%。
I am sure I wrote essays in the later years of high school without my mother's guidance, but I can't recall them.
我确信在高中的最后几年里，我在没有母亲的指导的情况下，写过很多文章，但是我记不起来了。
It will take them about five years to build the high speed railway.
他们将花费大约五年的时间来建造这条高速铁路。
It took nearly a thousand years before they perfected the process to produce high-quality ceramics known as porcelain.
他们花了近一千年的时间才完善了生产高质量陶瓷的工艺，这种陶瓷被称为瓷器。
China's high-speed railways have grown from 9,000 to 25,000 kilometres in the past few years.
在过去的几年里，中国的高速铁路长度已经从9000公里增长到25000公里了。
Most people's minds function at a high level even in their later years, according to researcher Timothy Salthouse.
研究人员蒂莫西·索尔特豪斯称，大多数人即使到了晚年，思维能力仍处于较高水平。
Some five years ago, high school seniors in America generally spent more than six hours a day on electronic devices.
大约五年前，美国高三学生每天花在电子设备上的时间一般超过六小时。
Interest in elite high school math competitions has grown in recent years.
近年来，人们对精英高中数学竞赛的兴趣有所增加。
SAT scores began dropping in 1963; today, on average, 30% of students do not complete high school in four years, a figure that rises to 50% in poor urban neighborhoods.
SAT分数从1963年开始下降；今天，平均有30%的学生没有在四年内完成高中学业，这一数字在贫穷的城市社区达到了50%。
Borlaug's advocacy of intensive high-yield agriculture came under severe criticism from environmentalists in recent years.
博洛格提倡集约化的高产农业，近年来遭到环保人士的严厉批评。
Two years ago, CEO Chris Cocalis of Pivot Cycles—which sells high-end mountain bikes—found that bike shops weren't interested in stocking ebikes.
两年前，销售高端山地车的Pivot 自行车公司首席执行官克里斯·考卡利斯发现，自行车店对储备电动自行车不感兴趣。
Two years ago, CEO Chris Cocalis of Pivot Cycles—which sells high-end mountain bikes—found that bike shops weren't interested in stocking ebikes.
两年前，销售高端山地车的Pivot 自行车公司首席执行官克里斯·考卡利斯发现，自行车店对储备电动自行车不感兴趣。
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