HSK 4
Tā yǔ wàijiè shīqù le liánxì.
He lost contact with the outside world.
HSK 6
Wàijiè duìcǐ yǒu hěnduō cāicè.
The outside world has a lot of speculation about this.
HSK 7-9
Zhège cūnzi jīhū yǔ wàijiè géjué.
This village is almost isolated from the outside world.