旅行前要做好保暖工作，一般诺布山山顶风都特别大，旧金山晚上的雾也会使气候变得更冷。
Be sure to dress warmly, it's usually quite windy on the top of Nob Hill and San Francisco evening fog makes it feel even colder.
了解卫生坑道环境卫生状况，为特殊情况下人员进驻后做好防潮保暖工作提供科学依据。
To study the sanitation in the tunnel in order to provide the scientific proof of moistureproof and warm-keeping after the humans entry in special situation.
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