地球的海洋是广阔的，未知的区域充满着未解的难题。
Earth's oceans are vast, unexplored regions full of unanswered questions.
科学家甚至发现海洋表层海水也含有相当多的甲烷，但其来源之谜迄今仍不得其解。
Even the surface waters of the ocean contain substantial amounts of this gas. But where that Marine methane comes was a mystery, Until now.
比较等截面管道的变分解和数值解，说明此方法用于研究海洋平台输液管道的流体激振是有效的。
Comparison between numerical result and variational solution shows that the method used in this work is effective for studying flow-induced vibration of pipeline on offshore platform.
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