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A two-bladed plug with one blade larger than the other, so that it can only be inserted into the socket one way round.
1930s; earliest use found in Decatur (Illinois) Herald.
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。