frozen ground的用法和樣例：
例句
- The thawed surface had frozen again and now the runners of the sled were stuck hard and fast to the ice.
解凍的水面又結上了冰，現在雪橇的滑板已牢牢地凍在冰上不能動了。 - It can be applied to break firm and freezed ground in civil engineering, substruction and civil air defence works and so on.
土木工程及地下建築，人防施工等工作中摧毀堅固凍結的地層。 - Snow soon blanketed the frozen ground.
凍土上很快就形成了一層厚厚的積雪。 - Frozen soil has tangible rheologic characteristics.
凍土有明顯的流變特性。
