Because of the barrier of ice to the east, the Pacific Ocean to the west, and populated areas to the north, there may have been a greater impetus for people to move in a southerly direction.
因为东面有冰的屏障，西面是太平洋，而且北面是人口稠密的地区，所以促使人们向南迁移的动力会更大。
2
Added a new rank of IceBarrier to mage trainers.
法师训练师增加一个新等级的寒冰护体。
3
The presence of sea ice and of permafrost helps protect Arctic barrier islands for much of the year.