Usually when you buy a ventilator in a hospital, you buy a different one for children, you buy a different one for transport. This one will do everything, and it will do it at half the price and doesn't need compressed air.
通常当你在医院里买呼吸机时 你会为孩子买一个不同的， 买一个能运输的。这个能做任何事， 只要一半的价钱，还不需要压缩空气。