英语词汇“floor opening”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	floor opening
释义	floor opening floor opening According to OSHA: an opening measuring 12 in. (30.5 cm) or more in its least dimension in any floor, roof, or platform, through which persons may fall.
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