根据最近发表的一项关于人口的研究，如果老年人要对社会作出贡献而不是成为经济负担，就必须给他们更多学习机会。
Older people must be given more chances to learn if they are to contribute to society rather than be a financial burden, according to a new study on population published recently.
根据最近的一项研究，获得研究资助的险胜者晋升为教授的机会更大。
According to one recent study, narrow winners of research grants had better chances to be promoted to professors.
根据最近的研究，学生做事拖延主要有三个原因。
According to recent studies, there are three main reasons that students put off doing things.
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