no such thing

例句：

1. 1. I've never seen a unicorn before, so I don't believe in them.
   我之前从未见过独角兽，所以我不相信它们。
2. 2. The idea of a flying car is just nonsense, right?
   飞行汽车的想法纯属幻想，对吧？
3. 3.He said he had no such thing to worry about.
   他说他没有这样的事需要担心。