Sometimes stopping for a moment is harder than staying busy.

有时候停下来要比继续忙着做事情更加困难。

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They'll sign in at village checkpoints, sometimes stopping for mandatory layovers.

NPR: Iditarod Kicks Off With Festive Ceremonial Start

The NYPD's practice of stopping, questioning and sometimes frisking hundreds of thousands of people on city streets each year has received widespread criticism.

NPR: NAACP Head: Even Some In NYPD Oppose Street Stops