在这种碳酸的帮助下，流动的水创造了世界上大部分的石灰岩洞穴。
With a little help from this carbonic acid, moving water forms most of the world's limestone caves.
今年世界水日的主题是“保障清洁水源，创造健康世界”，强调水资源质量和数量都面临威胁。
The theme of this year's World Water Day, “Clean Water for a Healthy World”, emphasizes that both the quality and the quantity of water resources are at risk.
贝加尔湖谷下陷裂开，最终填满了水创造了世界上最深的湖。
The baikal valley dropped away eventually filling with water and creating the deepest of the world's lakes.
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