Their mother has knitted them thick woollen socks to protect them.

母亲为他们织了厚厚的羊毛袜来御寒。

After going half a verst my feet began to feel cold, and I remembered that in the car I had taken off my woollen socks, and had put them in my travelling bag.

走了半俄里， 脚就凉了，想起在车上脱了毛袜， 放在行囊里。