许多人都有开始在研究，但至于他们是否能够坚持下去，却非我预料所及的了。
Many have begun it. I do not yet know whether or not they kept to it.
从十七世纪开始，国内外许多心理教育学家对联想心理开始进行研究。
Association has been studied by many foreign psychologists since the seventeenth century.
从十七世纪开始，国内外许多心理教育学家对联想心理开始进行研究。
Association has been studied by many foreign psychologists since the seventeenth century.
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