lay an obligation upon是什么意思，lay an obligation upon的翻译，lay an obligation upon音标、读音、用法和例句

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lay an obligation upon是什么意思，lay an obligation upon的翻译，lay an obligation upon音标、读音、用法和例句_流逝汉英词典

lay an obligation upon

基本解释

专业释义

土木建築工程