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In a proven manner.
Late 19th century; earliest use found in George Bernard Shaw (1856–1950), playwright and polemicist. From proven + -ly.
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。