All flowing water, though it appears to be uniform, is actually divided into extensive inner surfaces, or layers, moving against one another.
所有流水尽管看起来是一样的，实际上是分成了大量相互碰撞的内在表层。
Writing in the journal Nature, scientists say the decline appears to be linked to rising water temperatures.
科学家在自然杂志上撰文指出，这种下降似乎与水温上升有联系。
Looking at the "raw threats" to people's water security - the "natural" picture - much of western Europe and North America appears to be under high stress.
看看对人类水安全的“原始威胁”——“自然的”状况——西欧和北美大部分地区似乎都处于高压之下。
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