primary lesion

• 下疳

primary lesion的用法和样例：

例句

1. Syhilis, in its primary form, may produce a chancre on the lips.
   原发型梅毒可在唇上产生下疳。
2. The primary stage of syphilis is evident a couple of weeks after initial infection as a chancre at the site of inoculation.
   早期梅毒的重要特征是感染梅毒螺旋体两周后在原始部位形成硬下疳。