2 sentences

1. 赤道是南北半球的分界线。

   chì​dào shì nán​běi bàn​qiú de fēn​jiè​xiàn.

   The equator is the boundary between the northern and southern hemispheres.

   Source: UM-Corpus: Education

2. 换句话说，童年与成年之间并没有明显的分界线。

   huàn​jù​huà​shuō, tóng​nián yǔ chéng​nián zhī​jiān bìng méi​yǒu míng​xiǎn de fēn​jiè​xiàn.

   In other words, there is no clear dividing line between childhood and adulthood.

   Source: CCMatrix