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A degree of heat or a temperature that is not sufficiently warm enough to produce visible light.
Early 19th century; earliest use found in William Herschel (1738–1822), musician and astronomer.
雅致网英汉双解词典包含236457条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。