Over a decade or so, American teens' social media use shifted from an occasional activity to a routine one.

在过去十年左右的时间里，美国青少年对社交媒体的使用从偶尔的活动变成了日常活动。

youdao

Online time has doubled since 2006, and social media use has moved from a periodic activity to a daily one in the same period.

自2006年以来，上网时间翻了一番，而与此同时，社交媒体的使用也已经从定期活动变成了日常活动。

youdao

The results also show that the proteins would be absorbed by the body, allowing the in vivo antihypertensive activity to occur.

结果还指出，蛋白质会被人体吸收，使抗高压的活动在体内发生。

youdao

He said, "We continue to expect economic activity to bottom out, then to turn up later this year."

VOA: special.2009.05.08

It's got to have activity to play itself out as melody.

把它表现成旋律也必定要很活跃

耶鲁公开课 - 聆听音乐课程节选

And so the opportunity and need to invent just like any other startup or entrepreneurial activity remains strong.

因此发明创造的机遇和需要就像,任何创立活动一样，非常重要。

斯坦福公开课 - 微软CEO-Steve.Ballmer谈科技的未来课程节选

Employees were asked to report any suspicious activity to airport officials or to call 911.

CNN: Who's afraid to fly on September 11?

They compared the short-selling activity to downgrades by analysts at 14 of Wall Street's biggest brokerages.

FORBES: Tipping The Shorts

Of the two, only the First Progress card reports customer activity to all three credit bureaus.

FORBES: Best Credit Cards If Your Credit Is In The Doghouse