基本解释[数学]模的直和英汉例句双语例句When a direct sum of lifting modules is lifting is studied here.研究了提升模的任意直和在什么条件下仍是提升模。direct sum of modules更多例句词组短语短语external direct sum of modules 模的外直和direct sum of modules更多词组专业释义数学模的直和