Since it was very dark, she did not recognize him and explained, "I'm sorry, sir, but the professor is not at home."

终于，他的妻子来开门了。由于天很黑了，他妻子没看出来是他，于是就解释说：“非常抱歉，先生，教授不在家。”

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Excitedly, he announces to Professor Reiser that he wants to pursue Dark Matter for his thesis.

他兴奋地向导师宣布他要将暗物质作为自己的博士论文课题。

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Professor Dark says the issue of using organs which might be classed as less than perfect has to be addressed.

BBC: Repaired organs for transplant

Professor John Dark, head of the heart and lung transplant unit at the Freeman Hospital, Newcastle Upon Tyne, told BBC News Online that the solution used by the Swedish team to preserve the lung had probably also helped to improve its function.

BBC: Lung transplant breakthrough

King Professor of Egyptology at Harvard University, teaches these classes in a dark room that holds up to 20 students.

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