Shea takes me to a football field for a demonstration.

谢伊带我到足球场示范了一番。

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He was using several magnets together which compounded the effect. He said that he knew it was a demonstration of the magnetic field of the magnets.

他把几块磁铁合并起来加强了磁力，儿子说他知道这正显示了磁铁的磁场。

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By adapting the methods of documentation, investigation and field demonstration, the author makes a research on Shezu traditional sport.

通过文献资料、考察挖掘、田野实证等方法，对畲族传统体育进行了调查。

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Conservation International (CI) - Building upon a strong foundation of science, partnership and field demonstration, CI empowers societies to responsibly and sustainably care for nature, our global biodiversity for the well-being of humanity.

UNESCO: World Water Assessment Programme (WWAP)

The demonstration showed off the latest in affective computing, a research field attempting to teach computers to understand and adapt to human emotion.

FORBES: Magazine Article