He's going to teach us how to safely construct a snow hole.

他将教我们如何安全地建造一个雪洞。

When we came over the top it was considerably more than that, but once we are in the snow hole we will be very sheltered.

如果我们爬到山顶，风速会比现在大非常多，但是如果我们在雪洞里，防风效果会非常好。