According to Professor Johnson, we don't have to read the book if we don't want to, as it is optional.

根据约翰逊教授的说法，我们不想读这本书，就不必读，因为它是选读的。

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According to Professor Pretty, it was a conservative estimate.

根据普雷蒂教授的说法，这是一个保守的估计。

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The concept of a shadow biosphere, according to Professor Davies, "is still just a theory".

“阴影生物圈”的概念，戴维斯教授说，“只是一个理论而已。”

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The biggest challenge the Obama Administration faces in keeping that promise is finding a way to involve all Islamist movements in the process, according to Reza Aslan, a University of California associate professor of religion.

VOA: standard.2010.05.11

Well according to Professor Charlton the ATLAS team will actually be busier than ever.

BBC: Higgs boson discovered. What next for CERN laboratory?

Light industry will also provide jobs and a return on investments, according to Professor Faruqi.

BBC: Afghanistan's investment choices

According to Professor Wang Xiaolu of the China Reform Foundation, this is definitely not the case.

FORBES: Where Do China's Luxury Purchases End Up?