我以为我看见鬼了，其实只是一种。

I think I saw a ghost but it was just an optical illusion.

youdao

我以为我看见鬼了，其实只是一种幻觉。

I thought I saw a ghost but it was just an optical illusion.

youdao

我以为我看见鬼了，但这大概不过是灯光在捉弄人。

I thought I saw a ghost, but perhaps it was only a trick of the light.

youdao