He knows nothing about c__.He does not even know what H2O is
问题描述：
He knows nothing about c__.He does not even know what H2O is
答
chemistry
基本翻译
化学
答
He knows nothing about --chemisty__.He does not even know what H2O is
答
chemistry化学
如还有不懂的,还可以继续追问哦\(^o^)/~