The problem is that a tornado is too localized and too confined to account for all of the damage seen in Utrecht

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The problem is that a tornado is too localized and too confined to account for all of the damage seen in Utrecht. It might account for destruction in one particular __________ of the city, but it cannot explain why there were several hotspots of strong activity across a wide region of northwest Europe. But a particular form of storm system called a «bow echo» can.

1. section
2. zone
3. region
4. district