Explain the meaning of “the whit

Reading Comprehension : Read the quoted parts carefully and answer the questions in English. Write your answer in the corresponding space on the answer sheet.“The duties of her married life, contemplated as so great beforehand, seemed to be shrinking with the furniture and the white vapour—walled landscape. The clear heights where she expected to walk in full communion had become difficult to see even in her imagination; the delicious repose of the soul on a complete superior had been shaken into uneasy effort and alarmed with dim presentiment. When would the days begin of that active wifely devotion which was to strengthen her husband’s life and exalt her own?”
Explain the meaning of “the white vapour—walled landscape”
【正确答案】：

THE LANDSCAPE COVERED WITH WHITE SNOW.