And as the world grew colder, glaciers could’ve gone unchecked.

随着世界变得越来越冷，冰川可能会 不受控制。

Oppland's mountains present daunting terrain and in periods of extreme cold, glaciers could block the higher mountain passes and make travel in the upper reaches of the mountains extremely difficult.

奥普兰的山区地势险要， 在极寒时期，冰川会阻塞较高的山口， 使在山区上游的旅行变得极其困难。