名词
中文翻译：研究
同义词：
['investigation', 'research', 'study', 'investigation']
例句：
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1. The scientists conducted a series of studies on the effects of pollution on wildlife.
科学家们对污染对野生动物的影响进行了一系列的研究。
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2.He spent several weeks studying the ancient texts in his library.
他在图书馆里花了几周时间研究古代文献。
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3. The government has launched several studies to improve public transportation.
政府已经启动了几项研究，以改善公共交通。