For many years I have studied global agricultural, population, environmental and economic trends and their interactions.
多年来，我一直在研究全球农业、人口、环境和经济趋势及其相互作用。
In the 18th century, scholars who have studied the ancient languages, Sanskrit, Latin and Greek, noticed that these three languages had many similarities.
18世纪研究古代语言（梵语、拉丁语和希腊语）的学者们注意到这三种语言有许多相似之处。
Department of Agriculture, and Philip Martin at the University of California, Davis, have studied trends in mechanization to predict how US farms might fare.
美国农业部和加州大学戴维斯分校的菲利普·马丁研究了机械化趋势，以预测美国农场的发展状况。
Working with local geologists and engineers, the experts have studied the nature of the ground and the type of most practical building code for the local area.
通过与当地地质学家和工程师合作，专家们研究了当地土地的性质和最实用的建筑规范类型。
She must have studied English before.
她以前一定学过英语。
Medical researchers have studied the health benefits of the new tea.
医学研究人员研究了这种新茶的健康功效。
你一定学得很好！
Experts have studied the areas most affected and have drawn up a map for local people, forecasting the year in which their homes will be swallowed up by the hungry sea.
专家们研究了受影响最严重的地区，并为当地居民绘制了一幅地图，预测他们的房子将在哪一年被汹涌的海水吞没。
Lawyers who have studied mathematics can master the legal principles in a way that most others cannot.
学过数学的律师可以掌握大多数人无法掌握的法律原理。
We make these observations as research psychologists who have studied how schools and families can help young people thrive.
作为研究学校和家庭如何帮助年轻人成长的心理学家，我们做了这些观察。
Shakespeare probably attended the grammar school in Stratford, where he would have studied Latin and read classical literature.
莎士比亚可能就读于斯特拉特福德的文法学校，在那里他学习拉丁语，阅读古典文学。
You must have studied very hard.
你一定学习很刻苦。
Sociologists have studied and described it.
社会学家们对此进行了大量的研究和描述。
I have studied in the school for one year.
我在这所学校学习了一年了。
I have studied in this school for six years.
我已经在这个学校学习六年了。
I have studied ballet for more than eight years.
我学过八年的芭蕾舞了。
NASA scientists have studied Earth long enough to know this.
美国宇航局(NASA)的科学家们长期研究地球，对此了如指掌。
Nevertheless, scientists have studied the fruit's properties.
尽管如此，科学家们研究了水果的属性。
Yes. I have several friends who have studied abroad for years.
是啊。我有几个朋友都出国留学好几年了。
All who have studied the question have come to the same conclusion.
凡是研究这个问题的人都得出了同样的结论。
At one time or another, many of NASA's laboratories have studied solar sails.
某一段时间里，美国宇航局的许多实验室都在研究太阳帆。
Also, the researchers point out that they have studied only one person so far.
同时，研究人员指出，他们目前为止只对一个人进行了研究。
Strikingly, all are white collar workers and most have studied or worked abroad.
令人吃惊的是，所有参赛选手都是白领，而且大部分在国外工作或学习过。
Strikingly, all are white collar workers and most have studied or worked abroad.
令人吃惊的是，所有参赛选手都是白领，而且大部分在国外工作或学习过。
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