line of vacant sites是什么意思，line of vacant sites的翻译，line of vacant sites音标、读音、用法和例句

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line of vacant sites是什么意思，line of vacant sites的翻译，line of vacant sites音标、读音、用法和例句_流逝汉英词典

line of vacant sites

基本解释

专业释义

材料科学