When tides drag the ocean over a shallow barrier such as a ridge on the ocean floor, it creates waves in the lower, denser layer of water.

当潮汐经过像洋盆上的山脊等浅层障碍时，就会在低层密度大的水体里造成波浪。

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There was a squat toilet set into the floor, and in lieu of toilet paper a shallow well with a little plastic bowl floating on top.

里面的厕所是蹲式的，原本应该放手纸的地方被摆上了一口浅水槽，上面还漂着一只小小的塑料碗。

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MESSENGER science team members will also be studying the shallow ridges that crisscross Machaut's floor.

“信使号”科学团队也将对这些交错地表的沟槽进行研究。

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And if the changes in many countries remain shallow, the whole floor of public debate has clearly shifted to questions of when and how to reform, rather than why.

ECONOMIST: Tentative steps down the road to democracy | The

Of course, I think Obama would clean the floor with Herman Cain, whose depth of policy knowledge is shallow to say the least.

FORBES: Raising Cain: Why a Herman Cain Primary Victory Might Be a Good Thing

Scientists believe magma is now at a very shallow level and hot cracks in the dome are opening which is causing rockfalls on to the south crater floor.

BBC: Mount St Helens spews out steam and ash on 5 October 2004