1:跟你在一起的时候,我感觉到幸福.我知道只有你才能让我幸福.
I am on the top of the world when I am with you,and I know that you are the only person who can make me happy!
2:跟别人一块时,我没有幸福的感觉,而且是,没有任何感觉.
But when I am with others,I have no such felling at all.
on the top of the world 很地道的表达方式