so cold a day中cold a day为什么是adj啊?而a cold day是名词啊?

so cold a day中cold a day为什么是adj啊?而a cold day是名词啊? It's a cold day. 《A Cold Day》英语日记 A very cold day today,()()? clothes for a cold day It's a very cold day.中文是? on a cold winter day,还是in a cold cold winter day 相当冷的一天怎么译? 是It's quite a cold day.还是It's a quite cold day. ? 求歌.第一句话是the day so long and night so cold...a a a a .. have What a cold day today!同意句! How a cold day today?同意句 英语翻译What a cold,snowy day