colder
adj. 更冷的，越来越冷的（cold 的比较级）
例句
It was perceptibly colder.
天气明显地冷了。
《牛津词典》
The air became colder as we ascended.
随着我们往上攀登，空气就寒冷起来。
The wind-chill factor will make it seem colder.
风寒系数大，会使人觉得比实际温度更冷一些。
