::before - CSS:层叠样式表 | MDN

Before is a preposition, an adverb and a conjunction. Before means earlier than the time or event mentioned: …

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before怎么读? 新东方在线字典为用户提供单词before的释义、before的音标和发音、before的用法、例句、词组、词汇搭配、近 …

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Before means earlier than the time or event mentioned: …. Before as a preposition. We use before most …

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