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Have you ever noticed the colour of the water in a river or stream after a heavy rainfall?

你注意过每次下雨之后河水的颜色吗？你认为是什么导致了河水颜色的改变呢？

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Water is never found pure in nature; it is nearly pure when gathered in an open field, after a heavy rainfall, or from springs.

自然中的水绝不会是纯净的水，大雨过后在旷地里打的水或者从泉中打的水近乎纯净。

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The publicly-owned company said that a recent burst of rain had not resolved the issue as a sustained period of heavy rainfall was required to start replenishing the reservoirs.

BBC: Black Esk reservoir - courtesy Scottish Water

The wet weather was forecast to sweep north into the Highlands with a warning in place of heavy rainfall into Friday morning.

BBC: Floods block east coast rail line

The heavy rainfall accompanies a broad warming trend covering the southeastern United States and reaching into the Midwest, according to the weather service.

CNN: More rain for flooded parts of Louisiana