San Francisco, a leader in urban recycling, is preparing to enlist its canine population for a first in the United States: converting dog poop into energy.
2
周生贤的意见来自于其在环保部网站上发布的相应文章。
Mr Zhou's comments came in an essay posted on the website on the Ministry of Environmental Protection.
3
文章对网状拓扑中的虚环保护机制进行了研究，并对一种基于生成树的虚环构成算法进行了分析。
This paper studied the protection mechanism for virtual ring in mesh topology, and analyzed a construction algorithm for a virtual ring based on spanning tree.
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