There are some things we need to understand their own.是病句吗?怎么翻译?

问题描述:

There are some things we need to understand their own.是病句吗?怎么翻译?
我要表达“有些事情需要我们自己理解”的意思,怎么说

their own 后面还要接一些名词 不能their own 单独使用 比如 their own cars 他们自己的汽车
这句话应该像楼上所说的 把their own改为themselves
There are some things we need to understand themselves
有些事我们需要了解他们自己
There are some things we need to understand (by) ourselves