无线电波广泛存在于自然界中，从声波、光波到空间中的宇宙射线。
Radio waves exist in nature, from sound and light to cosmic rays in space.
居里夫人坚信自然界存在着能发出射线的物质。
Madam Curie insisted (that) there was something in nature that gave out radiation.
居里夫人坚信自然界存在着能发出射线的物质。
Madam Curie insisted that there was something in nature that gave off radiation.
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