https://online2.tingclass.net/lesson/shi0529/0009/9907/675.mp3
https://image.tingclass.net/statics/js/2012
on top of the world 在世界的頂端，非常高興，幸福到極點
They feel like they are on top of the world.
他們感到非常開心。
The island is amazing. I feel I am on top of the world.
這座島太美了，我開心死了。
