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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A key area of design activity is in the service interface definition model.

设计活动的关键之处在于服务接口定义模型。

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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.

FORBES: Why Does Arena's Obesity Drug Have Abuse Potential?

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