讲人话的英文翻译是“speak in plain language”，意思是用简单易懂的语言来说话。这个短语来源于对普通人语言的认识，它是指用平易近人的语言来讲解某些事情，以便使普通人能够理解。例句：

Please speak in plain language, I don't understand technical jargon. (请用普通语言讲，我不懂专业术语。)

The teacher tried to explain the concept in plain language, so that even the youngest students could understand. (老师试着用普通语言讲解概念，以便即使是最年幼的学生也能理解。)

总之，“speak in plain language”意思是用通俗易懂的语言来说话，这样普通人才能理解。