这块海绵比那块更密实，能吸收更多水。

This sponge is ___denser than that one and can absorb more water.

这篇论文太晦涩了，我读了好几遍还是没看懂。

The article is too ___dense, I've read it several times but still don't understand.

他太迟钝了，连这么简单的笑话都听不懂。

He's so ___dense that he can't even understand such a simple joke.