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An imagined line in a room from behind which no sky is visible from table height.
1920s; earliest use found in Illumination Research Technical Paper. From no + sky + line.
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。