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One reason is that going to the cinema is generally a social activity.

原因之一是，看电影通常是一种社交活动。

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Human activity is the main reason for this, the United Nations (UN) said.

联合国表示，人类活动是造成这一现象的主要原因。

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Mayor Rudolph Giuliani of New York can take pride in the news that, among users who said they had failed to get drugs at least once, Manhattanites were far more likely than those in other cities to report police activity as the reason.

ECONOMIST: Drug abuse

Napolitano responded that Tsarnaev's departure did "ping" in the homeland security screening system, but she noted that because the FBI's investigation in 2011 found no suspicious activity, there was no reason to follow up.

CNN: Bombing suspect not on terror watch list

The reason for all this activity is widely believed to be that because sex produces genetic diversity, it protects a species against environmental fluctuations and, in particular, against parasites.

ECONOMIST: The longest ��headache�� ever