set on fire使燃烧

例句：Some sparks from a passing train set the haystack on fire.
      一列过往火车迸发出的一些火花点着了干草堆。

2.It could go on as long as it takes to get the marshes and the beaches clean.

as long as只要, 如果

例句：I'll stay in Mexico as long as my money holds on.
      只要我的钱还能维持一天, 我就在墨西哥待一天。
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