Dr. Tonegawa won the Nobel Prize for discovering how the body can constantly change its genes to fashion a seeming unlimited number of antibodies, each specifically targeted at an invading microbe or foreign substance.
答案是(E) seemingly unlimited number of antibodies, each targeted specifically at
逗號後面的 each targeted specifically at 是用來補充說明前面的 antibodies嗎?
請高人指點一下 thx