The main purpose of education is usually different, based on certain subjects, including a complex concept system.

教育目的是一种主体指向的学术范畴，包含着一个内涵复杂的概念体系。

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In our perspective, it's important for Ruby fans to be united even though fans may have different views on certain subjects.

在我们看来，尽管我们在某些事件上有著不同的看法，但是如迷的团结却是至关重要的。

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That's-What-You-Think" Listening: You have your own pet ideas on certain subjects. You don't like to hear anything which might make you question them.

内心排斥式聆听：对于某些主题你会有自己的观点，就不愿意听到与之相左的见解。

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Books on certain subjects, such as creationism, conspiracy theories and new-age archaeology, spawn torrents of argumentative comments.

ECONOMIST: Amateurs on Amazon

Not everybody is going to catch on in certain subjects as easily as others.

WHITEHOUSE: The President��s Back to School Speech

Last September the then Education Secretary Charles Clarke said he wanted a "national debate" on whether certain key subjects should be protected in the national interest.

BBC: NEWS | UK | Education | Big fall in university languages