换句话说，声子在一个方向的流动比另一个方向更容易。
In other words, the phonons moved more easily in one direction than the other (Science, DOI: 10.1126/science.1132898).
LA系列采用高效H类电路，电源采用同步整流的开关电源，重量轻、体积小，特别适合流动演出扩声应用。
La Circuit Design class-H, power supply with synchronous rectification switching power supply, light weight, small size, especially suitable for mobile performance of anti-sound applications.
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