TV watching, often a solitary activity, is an obvious candidate for some social tips.

通常作为个体活动的看电视显然是某种社交窍门的备选项。

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On average, people between 14 and 21 spend almost eight hours a week online, but it is far from a solitary activity.

年龄在14至21岁间的青少年每周上网的平均时间几乎达8小时，但这8小时绝不是一个孤立的活动。

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Because learning is not a solitary activity but one that requires collaboration among people, students of all ages will benefit academically if they work frequently in groups.

由于学习不是一种孤立的行为而是需要人们之间合作的，所以各种年龄的学生如果经常小组学习的话就会在学术上受益匪浅。

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Even for such a hermitical figure as Thoreau, idea work was not a solitary activity.

FORBES: Thoreau's Idea Hunt, and Ours

Though it may be an individual sport, parkour is neither a solitary activity nor a zero-sum game.

FORBES: Parkour and Entrepreneurs

Five years ago, online gaming was considered a solitary activity, says David Williams, who heads up the Nickelodeon Kids and Family Games Group.

CNN: At-home entertainment and family bonding booms