关于是用this还是that的问题

The phase transitions between water and ice cause the destruction of soil skeleton, andthis/thatdestruction lead the increases in diameter of individuals.

想问一下，这里是否用this更好？

用来指上文提到的事情时，两者都可以。比如：

They’re students, not teachers. You know this [that]，of course. 他们是学生，不是老师，这点你当然了解。

John had a bad cold. That [This] was why he didn’t turn up. 约翰患了重感冒，这就是他没来是什么原因。

▲ 若要指下文叙述的事情，却一般只用this。比如：

I want to know this: Is he healthy? 我想了解这一点：他是不是非常健康？