什么是 plume?A feather, especially a large and showy one.A large feather or cluster of feathers worn as an ornament or symbol of rank, as on a helmet.A token of honor or achievement.A structure or form that is like a long feather: a plume of smoke. Ecology A space in air, water, or soil containing pollutants released from a point source.Geology An upwelling of molten material from the earth's mantle.To decorate, cover, or supply with or as if with plumes.To smooth (feathers); preen.To congratulate (oneself) in a self-satisfied way: plumed himself on his victory.