1. 谨防扒手
Beware of pickpockets [pickpocketing]!

《新英汉大辞典》

2. 在公共汽车上要谨防扒手
Please guard against pickpockets on the bus.

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3. 在公共汽车上要谨防扒手
Be on guard. There are pickpockets around here.

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4. 人们告诉我要谨防扒手
I was told to beware pickpockets.

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5. 告诫女士谨防扒手
Warn the lady against pickpockets.

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6. 告诫女士谨防扒手
Warn the lady against pickpockets.

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