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。
Their surfaces undulate to simulate Canada's terrain.
他们的表面是模仿加拿大地形而起伏的。
Put forward disposal idea and prevent measurement for quality abnormity undulate appears in entire produce process.
对生产全过程出现的质量异常波动提出处理意见和预防纠正措施。