fall into
phrasal verbfall into something 
- to be able to be divided into something可以分为;能够分成 - My talk falls naturally into three parts.我的讲话可以自然分成三个部分。 
 
- My talk falls naturally into three parts.
- to start doing something that you had not planned to do属于: 开始做你原本不打算做的事情- He says that he fell into politics by chance.他说他是偶然进入政界的。 
 
- He says that he fell into politics by chance.