外界的声音很吵。
wàijiè de shēngyīn hěn chǎo 。
The sounds from the outside world are very loud.
他很少与外界联系。
tā hěnshǎo yǔ wàijiè liánxì 。
He rarely communicates with the outside world.
我们需要了解外界的情况。
wǒmen xūyào liǎojiě wàijiè de qíngkuàng 。
We need to understand the situation in the outside world.