They bring great convenience to human beings, but they also join the group of damagingozone sphere at the same time.
它们给人类带来了极大的便利，但是他们同时也破坏了臭氧层。
2
Too high concentrations of ozone are damaging to the tissues.
臭氧浓度过高会损害到组织中。
3
Years ago, HFCs were widely adopted as an effective alternative to products that were damaging the ozone layer, particularly those used in refrigeration and air conditioning.