大船在暴风雨的海上随波起伏。
The ship surged in the stormy seas, rolling and pitching with each wave.
漂流线当作目标被随意的放着并随波起伏。
The drift line is littered with objects abandoned by the waves.
但是在将近1亿年前，现代蛇类的近亲们靠着它们船桨似的尾巴在白垩纪的水流里随波起伏，拖曳着它们短小而笨拙的后腿。
But nearly 100 million years ago relatives of modern snakes undulated through Cretaceous period waters aided by a paddlelike tail and dragging a pair of short, footless hind legs.
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