When the water reaches a certain level, it moves a lever and this shows the hours.

水位达到一定高度时，水将推动一个控制杆，从而显示时间。

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Once this reaches a certain level, the detector automatically activates the foghorn.

一旦湿度达到了一定的数值，探雾器就会自动激活雾号。

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When this article reaches a certain level of link anchor, when the rankings for that keyword is very helpful.

当这种链接锚文章达到一定层次的时候，对于该关键词的排名有很大的帮助。

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Once the battery charge reaches a certain level it operates like a typical hybrid-powered vehicle, with the 2.0-liter gasoline engine doing most of the work.

FORBES: Ford C-MAX Hybrid/Energi