专家提醒人们保持积极向上、乐观开朗的心态，以防止负面情绪累积造成“癌症性格”。

A positive mental attitude and a cheerful, optimistic attitude are needed to ward off the danger of cancer, experts suggested.

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此外，冻土层中存在着一定量的可移动的未冻水溶液，整个冬季不断向上迁移，所以造成水盐在冻层中大量累积。

The unfrozen water keep the source water transference in Winter. Vast salt ion is accumulated in the surface in frozen season.

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此外，冻土层中存在着一定量的可移动的未冻水溶液，整个冬季不断向上迁移，所以造成水盐在冻层中大量累积。

The unfrozen water keep the source water transference in Winter. Vast salt ion is accumulated in the surface in frozen season.

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