常见例句用作名词 (n.)He found that people who had had cowpox seemed to be safe from catching smallpox.他发现凡患过牛痘的人似乎对于天花具有免疫力。Jenner's experiment with cowpox opens up a new horizon in disease prevention.珍纳医师的神奇牛痘实验展开了疾病预防的新页。 返回 cowpox