For example, filters are always needed to discriminate against out-of-band signals and attenuate them down to very low levels while preserving full power in the bands of interest.
例如，总是需要的过滤器，以对带外的信号鉴别和衰减下来，以非常低的水平，同时保持全功率在感兴趣的频带。
This simple toy made of bamboo, cork and stretched rubber bands, fascinated the Wright brothers and sparked their lifelong interest in human flight.
莱特兄弟深深地迷上了这由竹子、软木和橡皮绷带做成的小玩意，并且在内心燃起了他们毕生对人类飞行的热爱。
When these three-dimensionally ordered macroporous materials have pore dimensions comparable to the wavelength of visible light, they are of interest as photonic band gaps and optical stop-bands.
当这些三维的有序大孔材料具有孔维度和可见光的波长相当时，它们就可以作为光子带隙和带阻。
When these three-dimensionally ordered macroporous materials have pore dimensions comparable to the wavelength of visible light, they are of interest as photonic band gaps and optical stop-bands.
当这些三维的有序大孔材料具有孔维度和可见光的波长相当时，它们就可以作为光子带隙和带阻。
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