ozone layer

layer of ozone high above the earth's surface that helps to protect the earth from harmful ultraviolet rays from the sun 臭氧层.

Oxfam, Oxford, oxidation, oxide, oxidize, oxidize, oxidise, Oxon, oxtail, oxy-acetylene, oxygen, oxygen mask, oxygen tent, oxygenate, oxymoron, oyez, oyster, oyster bed, oyster-catcher, oz, ozone, P, P and O, p and p, P, p, p.a. system, p.m., P.M./p.m., pa, pace, pacemaker, pachyderm, pacific, pacifically, pacification, pacifier, pacifism, pacifist, pacify, pack, pack it in,