昨天下午放学的时候天正下着大雪.(snow)
when school was over yesterday afternoon.
妈妈让他把手洗干净再吃午饭.
陆地上什么动物最重?
所有的教室昨天都打扫了一遍.
As the old saying goes, God helps those who help (他们自己).
The man is happily (描述)what he saw during his winter vacation.