wintertime

冬季、冬天

In the wintertime, the lake freezes over and children skate on it.

冬天湖面会结冰，小孩就在上面溜冰。

冬季的、冬天的仅用于名词前

Wintertime temperatures here often drop below freezing at night.

这里冬季的夜间气温常常降到零度以下。