cold - days前面加什么介词

前面加介词in，例如：

1、The second type referred to wine made in cold days.二是指天寒时节酿造而成的酒

2、Sometimes it snows in cold days.天冷的时候有时候还下雪。

3、The third type referred to wine made not only in cold days but also by freezing methods， which reflected a wine-making technique.三是指在天寒时节酿造并经过冷冻处理的酒，体现的是一种酿酒工艺。