关于那件很重要的事情.翻译成英文

about that important thing
it seems not so important...

It's about a very important thing.

This seems not very important.

it talks about the thing which is the most important!
i do not think it is the most important!
其实中翻英可以有好多种不同的表达方法,我只是写了最简单的

About that very important thing,...

This doesn't seem so important.