During the brief summer, a thin layer of frozen soil thaws at the surface.

短短的夏季里，表面很薄的一层冻土融化了。

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It is difficult to control the hole and the slope during frozen drill in profundity surface soil, this text bring forward some experience of management and construction.

针对深厚表土层中冻结钻孔存在的钻孔深、偏斜率难控制等施工存在的问题，提出了一些施工与管理的经验。

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In a number of areas the ground remains frozen beneath the surface, which means excess water will run into rivers instead of being absorbed by the soil.

BBC: Flood warnings issued after heavy rain and snow thaws