polemic

You can compare it to the visual arts, to painting, to drawing; it can document reality, like still photographs. It can explain and record like journalism, and it can be a polemic, like a pamphlet.

你可以把电影比作可视艺术进行描写绘制，可以像照片一样呈现事实，也可以像新闻一样进行解释和报道，同时还可以像小册子一样进行争论。

It's one of the most polemic subjects of ever: is there more intelligent life in the Universe or not?

这是史上最具有争议的课题之一：宇宙中到底还有没有其他高智商生物存在？