In this paper, the geometric essence of quadratic transformation in plane field is presented after studying the existing quadratic Troms formations.

本文对现有平方变换方法进行了研究，提出了平面场不同平方变换的不同几何实质。

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Police, civilians and helicopters were involved in the search in the mountains of Djupvik in the community of Kafjord in Troms.

CNN: At least 2 dead in avalanche in Norway

The family reunited late Saturday in the northern city of Troms, where Julie had flown with other youths from her region.

CNN: 'Mom, don't panic ... but there's a gunman going loose here'

"We have located two dead people in the avalanche, and one has been dug out alive, " Astrid Nilsen with the Troms Police District told CNN.

CNN: At least 2 dead in avalanche in Norway