这个词是什么意思？
That portion of the electromagnetic spectrum usually sensed as heat. Infrared wavelengths are longer than those of visible light, extending into the microwave frequencies. They are used therapeutically as heat, and also to warm food in restaurants.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D007259 · MeSH 2026。
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