At the city of Coba the Maya built dikes around a lake in order to raise its level and make their water supply more reliable.
在科巴市，玛雅人围绕着一个湖泊修建堤坝，以提高水位，使供水更加稳定可靠。
Some time in the coming decades, the shrinking of glaciers will cause a drop in the level of glacial runoff, reducing the supply of water to urban Chileans.
在未来几十年里的某个时候，冰山的消融会减少冰山径流，从而减少对智利城市居民的用水供应。
Fengfeng higher level of urbanization, water supply, electricity, gas, heating, communications and cable television infrastructure such as sound, the realization of a centralized supply network.
峰峰城市化水平较高，供水、供电、供气、供暖、通信及有线电视等基础设施健全，实现了网络化集中供应。
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