As we travel south, the countryside begins to undulate as the rolling hills sweepdown to the riverbanks.
随着我们游向南边，乡间的山丘变得连绵起伏与河岸相接。
《柯林斯英汉双解大词典》
3
This society emphasizes too much harmony, so the way they do that is by heavy-handed control - they try to put everything down and sweep it under the rug without solving problems.