1. Can't create a new version from an unfrozen version . 无法从未冻结版本中创建新版本。
2. Sometimes it took hours to chip away enough frozen earth to get to unfrozen ground. 有时候破开冻土层得花上几小时时间，才能挖到未上冻的土层。
3. Most people simply shake it up because there's some separation and use it as they would their regular unfrozen milk. 大多数人仅仅摇动瓶子，使牛奶块慢慢分离溶化，然后就像平常没冻结的牛奶那样喝。
