你在网上冲浪的时间偶尔会稍微多一些，但你对上网还是有自控能力的。

You may surf the Web a bit too long at times, but you have control over your usage.

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对于那些总是忙个不停、没有时间吃饭的人来说，蛋白质棒是偶尔代替正餐的不二之选。

For someone always on-the-go who may not have time for a meal, a protein snack bar can be a good option for occasional meal replacement.

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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。

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

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They can do it on rare occasions, or they can do it whenever they feel like it, or they can do it regularly; it's often done quarterly.

他们可以偶尔为之,也可以在任何时间发放,或者定期发放,一般是一季一发

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