There were no special materials to block the noise of the engines.
没有特别的材料来阻隔引擎的噪声。
Researchers in America and the U. K. are developing special materials that steer light around an object.
美国和英国的学者正在研发特别的材质，能将光线从物体周围移开。
Researchers in America and the U. K. are developing special materials that steer light around an object.
美国和英国的学者正在研发特别的材质，能将光线从物体周围移开。
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