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 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。
I have studied Mandarin Chinese in Shanghai but I think it is a terrible place to learn.
我已经在上海学习中文学习了一些年，但是我觉得上海是一个不好的地方学习中文。
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。
Firstly, I have studied the teacher's experience of performing as a Black Head in Peking opera.
一条是我对这位教师曾从事过京剧黑头这段表演经历的研究。
The area which I have studied is located on the source area of the Huaihe River, in Henan province.
研究区域位于淮河流域的河南省境内，属于淮河上游、大别山北麓。
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。
According to this one form, I have studied demand of numerical control machine tool to electric motor.
根据这一形式我研究了数控机床对电动机的要求。
I have to teach people there how to make computers, so I have studied English conversation for two years.
因为我得在那儿教人怎么生产计算机，所以已经学了两年的英语会话了。
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。
Now I have studied English for two years, I enjoy learning it a lot, I feel so lucky that I make the right choice.
现在我已经学习英语两年了，我很享受学习英语，我做出了正确的选择，我觉得很幸运。
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 running books, made friendship with other runners and I can report that I love it now more than ever.
我纯粹是为了乐趣而跑。我学习教跑步的书，与其它的跑手交朋友。我能说我从未像现在这样热爱跑步。
A: Yes, I have studied in an English training program and a computer training program since I graduated from university.
是的。毕业后我曾经参加过英语培训和计算机培训。
I have studied this material and have given myself an edge in order to get a better paying job at a technology company.
我已经读完这份教材，还让我自己因此而在一家科技公司获得一份薪资更为优渥的工作。
B: Yes, I have studied in an English training program and a computer training program since I graduated from university.
是的，毕业后我参加了英语和计算机的培训课程。
An instructive example is provided by the ants, which I have studied for most of my scientific career (and continue to study).
我研究了大半生(而且还会继续研究)的蚂蚁无疑是个非常具有启示意义的例子。
I have studied a number of well-off family history and found that they cross-generation, or the older generation is well-off.
我研究了许多富户的家史，发现他们隔代或上一代就是富户。
In some ways I am not the best person to give advice here, because whenever I have studied a language, listening has always been my weakest area.
某种意义上讲，我可能给不出最好的建议，因为在我学语言的时候，听力一直是我的弱项。
Now I can speak English much better, and even understand English television, because I have studied hard and my teachers and classmates have helped me a lot.
现在我英语说得好多了，甚至可以看懂英语电视，这是因为我学习很努力，老师和同学对我的帮助也很大。
Now I can speak English much better, and even understand English television, because I have studied hard and my teachers and classmates have helped me a lot.
现在我英语说得好多了，甚至可以看懂英语电视，这是因为我学习很努力，老师和同学对我的帮助也很大。
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