ebb and flow的用法和樣例：
例句
- Throughout history empires have waxed and waned.
歷史上各個(gè)帝國革故鼎新均有興衰。 - I am reading a book about the rise and fall of the Roman Empire.
我正在看一本關(guān)于羅馬帝國興衰的書(shū)。 - The ship pitched and tossed in the rough seas.
輪船在洶涌澎湃的大海中起伏顛簸。 - And the tempo of the sea speeded up.
同時(shí)大海的起伏動(dòng)蕩加劇了。
