Normal swells, known technically as gravity waves, are created by wind pushing the surface of the sea up and gravity then pulling it down, causing it to bounce.

一般的波浪，技术上被成为重力波，是由于风推动着海洋表面上升而后又在重力的作用下被拉向下方，这便会导致海水的回弹。

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The reason for causing these accidents mainly has two respects. On one hand caused by natural factor, it is caused by human factor on the other hand.

引起这类事故的原因主要有两个方面，一类是自然因素引起的，另一类则是人为因素引起的。

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Mainly by causing a workflow step to emit some event to the engine so it can process it and react to it.

它主要通过让工作流步骤发出事件给引擎，从而使引擎可以处理这个事件或对该事件做出反应。

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Separately they have little effect, but together they prevent hep-C from spreading by causing it to make defective virus cells.

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And the reasonably valuable bit of the bank that RBS has been forced to sell by the European Commission is causing it even more of a headache than it feared.

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Gas and dust would have piled up in the dead zone, increasing its density and causing it to heat up by gravitational compression.

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