Southern Cross uses nature as a teaching tool.

南十字星座利用自然作为教学工具。

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The video has become an invaluable teaching tool.

录像已经成为非常有用的教学手段。

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That makes them a good teaching tool to explain how real science works.

这种错误往往会变成一个很好的教学工具，来解释真正的科学是如何运作的。

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But we're saying there must be comprehensive responsible gaming and problem gambling education if you're using it as a teaching tool.

WSJ: School Club's Success Cheers Poker's 'Mind Sport' Champions

They realized their experience as patients would be a valuable teaching tool.

NPR: Medical Lesson: Learning to Relate to Patients

Penny Chisholm, a professor of environmental science at MIT, said she'd welcome the chance to use a GZA album as a teaching tool.

WSJ: GZA on 'Dark Matter' Album - Interview: Rapper Finds Muse in the Stars