1998年世界水日正题：泉水-看不见的资源(ground water-invisible resource) 1999年世界水日正题：咱们永恒糊口在缺水状况之中(everyone lives downstream)
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Time is a valuable, unique and invisible resource.
时间是一种珍贵的、独特的无形资源。
The accumulation of the credit forms a fine invisible resource which embodies in credit capital, credit culture and credit ability.
这种资源外化为：信用资本、信用文化、信用能力三个维度。
Wireless spectrum, while invisible, is not an infinite resource. In fact, it's pretty damn constricted, at least in crowded urban areas.
无线带宽，虽然看不见，但也不是一种无穷无尽的资源。事实上，无线带宽异常之小，至少在拥挤的城市中如此。
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