In dry areas, the wind is the principal agent of erosion.

在干旱地区，风是侵蚀的主要因素。

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In dry areas the wind is the principal agent of erosion.

在干旱地带，风是大自然侵蚀的主要手段。

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Convection is the principal agent of heat transfer in the atmosphere and oceans.

对流是大气和海洋中热传输的主要方式。

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An interesting example of the workings of the principal agent problem perhaps?

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To overcome some of what we call the principal agent problem.

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As time went on though, the principal-agent problem manifested itself in each one.

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