As we travel south, the countryside begins to undulate as the rolling hills sweep down 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》

Travel: the places you always wanted to visit: by the seaside, in the country, in the hills.

旅行：去你想去的地方：海边，乡下或小山坡。

youdao

Travel: The places you always wanted to visit: by the seaside in the country in the hills.

旅行：去你想去的地方：海边，乡下或小山坡。

youdao

Jakarta's water problems start with poor infrastructure that allows human waste and rubbish to contaminate supplies that travel roughly 80 kilometers from the hills where Jakarta's main reservoir is located.

VOA: standard.2010.08.04