https://online2.tingclass.net/lesson/shi0529/0009/9907/675.mp3
https://image.tingclass.net/statics/js/2012
on top of the world 在世界的顶端,非常高兴,幸福到极点
They feel like they are on top of the world.
他们感到非常开心。
The island is amazing. I feel I am on top of the world.
这座岛太美了,我开心死了。