蛋糕的分割需要精确，以确保每个人都能得到相同大小的份额。

The ___divisions of the cake must be precise to ensure everyone gets an equal share.

公司的研发部门专注于创新产品的开发。

The R&D ___division of the company focuses on developing innovative products.

公司内部的分歧阻碍了项目的进展。

The ___divisions within the company are slowing down the project.

这座山脉是两国之间的天然分界线。

The mountain range serves as a natural ___division between the two countries.

老师用苹果来教我们除法。

The teacher used apples to teach us ___divisions.