名词
中文翻译：研究
同义词：
['study', 'research']
例句：
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1. The student is engaged in an etude on the history of the country.
这位学生正在研究这个国家的历史。
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2. He has been working on his etude for weeks.
他已经在写他的论文几周了。
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3. The professor gave us an etude on the importance of environmental conservation.
教授给我们上了一堂关于环境保护重要性的课。