起伏

• Farming has been an up-and-down industry .
  务农一直是起伏不定的行业。
• The surface shows deep rill－like folds .
  表面有深沟槽状起伏褶皱。
• And the tempo of the sea speeded up .
  同时大海的起伏动荡加剧了。
• There were many ups and downs in the earth's numbers .
  世界人口数量变化起伏不定。
• His broad chest heaves with pleasure .
  他那宽阔的胸膛，由于满腔欢乐，所以起伏不止。
• The waves danced in the sunlight .
  波浪在阳光下起伏。
• Relief must not be so excessive .
  地形不应起伏很大。
• The stormy sea is boiling .
  暴风雨中的大海汹涌起伏。
• His chest heaved and his body seemed to droop .
  他的胸脯上下起伏，身子也好象衰颓了。
• There was a terrible grace in the move of the waves .
  起伏的波涛有一种令人敬畏的美。