frozen ground的用法和样例：
例句
- The thawed surface had frozen again and now the runners of the sled were stuck hard and fast to the ice.
解冻的水面又结上了冰，现在雪橇的滑板已牢牢地冻在冰上不能动了。 - It can be applied to break firm and freezed ground in civil engineering, substruction and civil air defence works and so on.
土木工程及地下建筑，人防施工等工作中摧毁坚固冻结的地层。 - Snow soon blanketed the frozen ground.
冻土上很快就形成了一层厚厚的积雪。 - Frozen soil has tangible rheologic characteristics.
冻土有明显的流变特性。
