filament broad
丝广泛
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Edison bulbs function by making a Tungsten filament very hot, and a hot object glows: radiating energy on a broad spectrum of wavelengths, only a small part of which is visible to the eye.
FORBES: LED Light Bulbs Mature At Last
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