The point of reference for semantic knowledge is the world.

获得语义知识的参考点是这个世界。

《柯林斯英汉双解大词典》

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Or to help modern-day readers to understand something historical, maybe these writers think a familiar frame of reference is needed.

或者是为了帮助现代读者理解历史，也许这些作者认为，这需要一个为人所熟知的参考架构。

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"He was young and I had a very good time drawing his picture because I used a lot of reference material that were paintings made of him at different times in his life.

VOA: special.2009.02.27

The problems that Frost's poetry poses for us as readers are not problems of reference. They can't be solved by footnotes.

他的诗歌给我们的困难,不是参考的问题，它们不能就用脚注解决。

耶鲁公开课 - 现代诗歌课程节选

If you're an inertial observer, then in your system of reference, objects left at rest will remain at rest.

如果你是惯性观察者,那么在你的参考系内,静止的物体会保持静止

耶鲁公开课 - 基础物理课程节选

There are tens of thousands of reference apps, covering every sphere of human knowledge.

FORBES: The Best Reference Apps For Smartphones

"Our point of reference is he was a kind, gentle, soft-spoken teenager, " Ms. Page said.

WSJ: Sikh Temple Shooter Linked to Hate Group

As a point of reference the US has about 250 retail stores while China has 11.

FORBES: Move up http://i.forbesimg.com t Move down