The only cells it really infects are what we call respiratory epithelial cells, a one-cell layer of cells that kind of protect the breathing tubes and the lungs, all the way down to the bottom, where we have air sacs.
唯一真正受到感染的细胞是我
所说的呼吸上皮细胞,一种保护呼吸管和肺的单细胞层,一直到管道底部有气囊的地方。