She's vanished into thin air.

她在空气中消失了。

youdao

They stepped on the first step and vanished into thin air.

他们一踩到第一级台阶，就迅速消失在了稀薄的空气之中。

youdao

Duke: I tried to stop her, but she vanished into thin air.

公爵：我已经尽力去阻止她了，可是她还是消失无踪影。

youdao

Mr. WALI: (Through translator) They vanished into thin air because no one makes any money from our organization.

NPR: Blind Man Aids Some Displaced Iraqis

There was a great deal of smoke and explosions and he vanished into thin air, with his back pack, with his boots, with his rifle.

BBC

Even as Malaysian Airlines Flight MH370, which was headed from Kuala Lumpur to Beijing, seems to have vanished into thin air, two people listed on the flight manifest remain safe.

BBC: How safe is your passport?