injury to the body caused by severe cold, usually to someone's toes, fingers, ears, or nose, that does not cause permanent damage, but can become frostbite if the cold continues

Frostnip is a superficial freeze injury that causes no tissue loss. 亚冻伤是一种浅表冻伤，不会造成组织损伤。

Dress your child in layers, make sure he comes indoors at regular intervals, and watch for frostnip, frostbite's early warning signal. 给孩子多穿几层衣服，确保他每隔一段时间就回到室内来，并注意亚冻伤情况，即冻伤的早期警告信号。