continuum
n
(pl ~s or -ua) graded sequence of things of a similar kind, so that the ones next to each other are almost identical, but the ones at either end are quite distinct; cline 连续统一体.
We set off down the hill. At first it was easy walking over the grass. Then the grass turned to bushes and the hillside became steeper. We climbed over rocks, through trees and found it more and more difficult to get down the hill. By now we were beginnin