Beavers live near streams and rivers and they block up the streams and rivers with like logs and sticks and mud.
海狸住在小溪和河流附近，它们用木头、树枝和泥巴堵住小溪和河流。
To investigate this effect, Clements and his team placed screens over small segments of a dozen mountain streams to block ultraviolet light, and left them there for 60 days.
为了调查由此产生的影响，克莱门茨和其研究小组选取了十几条山间溪流，将遮盖板放置在溪流的某一段以阻挡紫外线对溪床的照射。
Little DAMS on farms, which block small streams or trap run-off from rain or flooding, are an even bigger worry.
农场上的小水坝更是个担忧，它们拦住小溪，或者挡住雨水和洪水的径流。
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