dense/density

dense /dens/ adj. 密的，稠密的：The crowd was so dense that we could hardly move. 人群密得我们不能向前。It was difficult to see through the dense fog. 透过浓雾看东西是困难的。 

density /ˈdensiti/ n. ［u］密度， 浓度：the population density人口密度 Iron has a greater density than wood. 铁比木头密度大。［考句］Britain has the highest density of road traffic in the world over 60 cars for every mile of road.英国是世界上道路交通最为密集的国家，每英里道路超过60辆汽车。