求翻译：I understand exhibitions are back to evenings but, our business depends upon the exhibition room being comfortable; whoever installed the a/c was negligent because the a/c installation is not working. From the photographs I have seen, it is obvious that a simple commercial extractor fitted in the window space would expel the hot air and the a/c work properly.是什么意思？

待解决 悬赏分：1 - 离问题结束还有