Einstein said: "Learning, constantly pursuing truth and beauty, is the sphere of activity which can always keep our youthful vitality" (Selected Communication of Einstein, page 62).

爱因斯坦说：“学习，不断地追求真理和美，是我们能永葆青春的活动范围”(《爱因斯坦通信选》，第62页)。

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The success in any sphere of human activity is often attributed to intense interest plus persistent efforts.

人类任何活动领域的成功都常常被归因于强烈的兴趣和不懈的努力。

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LEO: Your sphere of activity, and possibly your experience of the world, will change. In fact, you'll probably become more worldly.

狮子座： 你会随着自己活动圈子和生活经历的改变而变得越来越世故。 注意啊。

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The Internet has become the public space of the 21st century, a sphere of activity for all kinds of activities, open to all people of all backgrounds and all beliefs.

WHITEHOUSE: VP's Remarks to London Cyberspace Conference

Which means that you might just as well set sail in search of an eighth continent as try to find a sphere of human activity unchartered in the blogosphere.

CNN: Shortcuts: Writing a blog

Kinect has been touted as a way to get more physical activity into the traditionally sedentary sphere of video games since the days of Project Natal, and now it appears like Microsoft is developing some powerful new software to start quantifying just how much players are moving around.

FORBES: Report: Microsoft Working on "Kinect Play Fit" With Heart-Rate Monitor