Based on the previous studies on motivation, a classification of motivation is made.

基于对理据的先行研究，作者在文中对理据的类型做出了分类。

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Based on the previous studies, this paper makes some improvement in these aspects and does some further studies.

因此，本文在前人研究的基础上，在上述几个方面进行一定程度的改进，做一些探索研究。

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Based on the previous studies of Lawrence s works, this thesis mainly explores the transcendental colors in his works.

在前人对劳伦斯文学作品研究的基础上，本文主要探索了劳伦斯作品中的超验主义色彩。

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It seems documentary-maker Chris Terrill has hit the jackpot again, building on the success of his previous studies of enclosed communities in Jailbirds and The Cruise.

BBC: The Ship

He said it was beneficial to know what is going on in living animals because in previous studies the findings were based on postmortem examinations.

BBC: NEWS | Health | Tool to help find new brain drugs

Previous studies on the topic have largely focused on younger children, whereas this study shed light on how preteens and teens fare emotionally, socially and academically, she said.

CNN: Study: Military teens have more stress