浓密的黑烟从烟囱中涌出。

___Thick, black smoke was pouring out of the chimney.

烟雾如此浓密，以至于我们无法看透。

The smoke was so ___thick that we couldn't see through it.

浓雾使得驾驶变得危险。

The ___thick fog made driving hazardous.