dense
[dɛns]
a. 密集, 浓厚

1. One or two of the students in my class are a bit dense.
   班两点迟钝。
2. I can't see anything in this dense mist.
   浓雾里，什看见。
3. They hewed their way through the dense jungle.
   浓密丛里辟路。

dense
[ adj ]

1. permitting little if any light to pass through because of denseness of matter

<adj.all>
dense smoke
heavy fog
impenetrable gloom

2. hard to pass through because of dense growth

<adj.all>
dense vegetation
thick woods

3. having high relative density or specific gravity

<adj.all>
dense as lead

4. slow to learn or understand; lacking intellectual acuity

<adj.all>
so dense he never understands anything I say to him
never met anyone quite so dim
although dull at classical learning, at mathematics he was uncommonly quick
dumb officials make some really dumb decisions
he was either normally stupid or being deliberately obtuse
worked with the slow students

Dense \Dense\, a. [L. densus; akin to Gr. ? thick with hair or
leaves: cf. F. dense.]
1. Having the constituent parts massed or crowded together;
close; compact; thick; containing much matter in a small
space; heavy; opaque; as, a dense crowd; a dense forest; a
dense fog.

All sorts of bodies, firm and fluid, dense and rare.
--Ray.

To replace the cloudy barrier dense. --Cowper.

2. Stupid; gross; crass; as, dense ignorance.