fall into
1．come down from a higher place落入
The child fell into the lake and had to be pulled out．小孩落入湖中，必须把他拉上来。
2．flow into流入
The river falls into the sea．这条河流入大海。
3．form；acquire 养成
Don't let children fall into bad habits．不要让孩子养成坏习惯。
4．begin开始
He fell into a quarrel with his classmate．他与同学吵了起来。
5．be divisible into分成
His book falls into four chapters．他的书分成4章。
6．belong to 属于
Things of a kind come together，people of a mind fall into the same group．物以类聚，人以群分。
7．pass into（a certain state，etc．）进入（某种状态）；陷入
She was so tired that she fell into a doze in the armchair．她十分疲劳，以致于在扶手椅里睡着了。
The company has fallen into extreme difficulties due to the economic depression.这家公司由于经济萧条，陷入了困境。