study的过去式和过去分词都是 studied，adj.刻意的；精心安排的；v.学习；攻读；审视；端详；细看；研究；调查；
第三人称单数： studies复数： studies现在分词： studying
Physiology is the study of how living things work.
生理学是研究生物功能的学科。
The report found that 30% of the firms studied had failed within a year.
据报告称，受调查的公司有30%一年内倒闭了。
He studied politics and economics at Yale.
他曾在耶鲁大学学习政治学和经济学。
I studied Italian so that I would be able to read Dante in the original.
我学习意大利语以便能读但丁的原著。
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