对许多美国人来说，2013年以一段不同寻常的严寒期结束。

For many Americans, 2013 ended with an unusually bitter cold spell.

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当冰河期接近尾声，气温也随之上升时，又出现了两段严寒时期。

As the glacial period drew to a close and temperatures began to rise, there were two final cold snaps.

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寒冷或严寒地区的隧道常在春融期出现渗漏并引发各种冰冻，造成隧道病害。

Leakage often occurs in the tunnel at cold region during the spring thawing period and results in some tunnel diseases.

youdao

寒冷或严寒地区的隧道常在春融期出现渗漏并引发各种冰冻，造成隧道病害。

Leakage often occurs in the tunnel at cold region during the spring thawing period and results in some tunnel diseases.

youdao