The police officer pressed two passersby into service to warn off traffic.

警察临时将两名路人找来协助指挥交通。

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The police have put up signs to warn people off this area.

警方已竖起了标示牌，告诫人们不要靠近这一地区。

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Does he warn his friend off such a path?

他会警告他朋友离开这条路吗？

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Does he warn his friend off such a path?

他会警告他朋友离开这条路吗？

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