"thin air" in Chinese (Simplified)
凭空稀薄的空气（字面意思）
Definition
“Thin air”是英语中“突然出现/消失”或“凭空”的表达，也可以指高海拔地区的稀薄空气。
Usage Notes (Chinese (Simplified))
常与appear、vanish等动词搭配，表达“out of thin air”或“vanished into thin air”。比字面意思更常用在比喻“突然、凭空”的情境中。属于日常表达，不正式。
Examples
The magician made the rabbit appear out of thin air.
魔术师让兔子凭**空**出现。
The plane disappeared into thin air.
飞机消失在**空中**。
He seemed to come out of thin air.
他好像是凭**空**出现的。
These ideas didn’t just come from thin air; we did a lot of research.
这些想法不是凭**空**出来的，我们做了很多研究。
He vanished into thin air before anyone could stop him.
他在人们还没来得及阻止时，就已消失得无影无踪。
You can't expect solutions to problems to appear out of thin air.
你不能指望问题的解决办法会凭**空**出现。