Social networks built on Web 2.0 concepts has become so cost affordable and easy to use that more and more people are migrating to this wave.
构建在Web 2.0概念之上的社交网络具有非常低的成本和很好的易用性,因此越来越多的人加入到这一热潮中。
Chris Retzler has built a prototype of a machine called the wave rotor.
克里斯·雷兹勒做出了一台叫做波转子的样机。
Engineers have built dozens of the machines, called wave-energy converters, and tested some on a small scale.
工程师们已经造出了几十种被称作“波浪-能量转换器”的机器,其中一部分还通过了小批量测试。
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