7. on top of the world
身在世界之顶，当然感到极度幸福 !
Winning a gold medal was the happiest moment of my life. I was on top of the world.
赢得金牌是我人生中最开心的时刻，我犹如身处世界之顶，极度幸福了！
8. full of the joys of spring
感受到春天的美好，当然是愉悦至极！
Laura has a new boyfriend. She is full of the joys of spring.
Laura 交了新男朋友，春风满面，好幸福！
9. be walking on air
感觉飘飘然，就像在空中漫步，真是高兴极了！
After the delivery of her baby, Annie was walking on air.
生下孩子后，Annie 心情好极了！
10. happy as a clam
躲在泥土里的蛤蜊只有在低潮的时候才能被找到，涨潮时是挖不到的。因此涨潮时的蛤蜊最快乐了，因为不会被挖出来吃掉。
Matt is happy as a clam living all by himself in the little house by the sea.
Matt自己住在海边的小屋中，他非常地开心！
11. like a dog with two tails
狗在高兴或兴奋的时候会摇起尾巴，所以想像一下，如果一个人像狗一样摇起了两条尾巴，该是多么开心呀！
When Jerry won the first prize, he was like a dog with two tails.
Jerry赢得了第一名，他多么高兴啊！
12. in seventh heaven
字面上的意思是身在第七重天，这是上帝的所在，至高无上的境界，当然快乐极了。
Heidi is in seventh heaven after learning she’s pregnant.
Heidi得知她怀孕后，快乐极了！
