Tourists Should Respect the Local Customs游客应尊重当地风俗 Chemical Contamination of Water化学物质污染水源 Reading Selectively or Exteively？是博览群书还是有选择的读书？
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全世界的河流、湖泊和含水土层的减少速度超过了大自然循环水资源的速度；工业和生活用化学物质正迅速污染仅有的水源。
Around the world, rivers, lakes, and aquifers are dwindling faster than Mother Nature can possibly replenish them; industrial and household chemicals are rapidly polluting what's left.
从怀俄明州到宾夕法尼亚州的居民都担心这些有毒化学物质会渗入地下蓄水层、污染水源，而且在很多钻进里面，他们抱怨地下水已经被污染了。
Residents from Wyoming to Pennsylvania fear that the chemicals will seep into aquifers and pollute water supplies, and in some cases they complain it already has.
工业企业向河流倾倒的有毒化学物质，污染了水源。
Industries pollute rivers by dumping poisonous chemicals into them.
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