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。
I have studied English for six years.
我学习英语已经六年了。
I have studied English for many years.
我已经学英语很多年了。
I have studied English for five years.
我学习英语五年了。
I have studied English for four years.
我学英语已经有四年了。
I have studied English since I came here.
自从我来这里，一直在学英语。
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。
I have studied ballet for more than eight years.
我学过八年的意大利舞了。
When I have studied a book I write a report on it.
我研读完一本书后就写一篇报告。
I have studied in my middle school for three years.
我读中学三年了，在这里我学到了很多。
I have studied plant pathogens for more than 50 years.
我本人对植物的病原体已经进行了50多年研究。
I have studied ballet and classical piano for 10 years.
我已经研究了10年的芭蕾和古典钢琴。
Tonight I have studied English for a long time and remembered a lot of new words.
今晚学了好久英语,记了好久单词.
For more than 40 years, I have studied some of our closest relatives in the animal kingdom.
四十多年来，我一直在研究动物王国里与我们最相近的一些动物。
Over the past 14 years, I have studied productivity, the learning process, and time management.
过去的14年来，我一直学习如何提高效率，学习方法以及时间管理等等的知识。
On the other hand, I have studied devotion, so I may have some theoretical knowledge about it.
但另一方面，我研究过虔诚心，所以可能对它有一些理论上的知识。
As a specialist in linguistics, I have studied how the conversational styles of men and women differ.
作为语言学专家，我研究过男女谈话方式的差异。
I have studied the impedance-matching of RF transmission line between the antenna and the GPS module.
重点分析介绍研究了GPS天线到接收模块GPS信号输入端之间射频传输线的阻抗匹配问题。
As a physical anthropologist, I have studied early hominid bones and reconstructed specimens of our predecessors.
身为体质人类学家，我曾研究过早期人类及人类祖先的骨头，也曾重建人类祖先的样貌。
I have studied its skills recently at a training school. I plan to run a restaurant, so I have to practise cooking!
我最近在一家培训学校学习烹调技巧，打算开一家餐馆，因此我不得不练习练习。
I have studied its skills recently at a training school. I plan to run a restaurant, so I have to practise cooking!
我最近在一家培训学校学习烹调技巧，打算开一家餐馆，因此我不得不练习练习。
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