swim in the sky的用法和样例：
- A cloud is a mass of vapor in the sky.
- The part of the bird that's not in the sky, Who can swim in the ocean, And yet remain dry.
- The smoke from chimney is spreading out in the sky.
- Smog hung in the sky (over the city).
- Can swim in the water, while flying in the sky, this extraordinary ability, who is also regrettable that it shall not, in order to make it a powerful era of skymaster.
- It is so hot, our desire to swim in the pool is irresistible.