Erosion, of course, is one of the key reasons for its destruction, but human activity is also increasingly responsible.

当然，侵蚀是造成其破坏的主要原因之一，但人类活动应承担的责任也越来越大。

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Some people might argue physical fitness wins the day for the players and teams, whereas, others believe a key factor in any sports activity is mental attitude.

一些人可能会认为身体健康对运动员和球队来说是最重要的，然而，另一些人认为任何体育活动的关键因素是精神状态。

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Researchers have determined that Culp's brain accepts the new face, based on activity in key brain areas.

CNN: Face transplant patients: Where are they now?

Poor diet and insufficient physical activity are two key factors in the modern rise of obesity rates, with genetics a surprisingly minimal contributor to weight gain.

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Increased user activity is the key to satisfying partners, including advertisers who need to deliver richer ads and developers who will get more interactions from users.

WSJ: Facebook Unveils Sweeping Changes to News Feed