正對(duì)稱組 positive definite symmetric kernel: 正定對(duì)稱核positive definite symmetric matrices: 正定對(duì)稱矩陣symmetric system: 對(duì)稱系統(tǒng)positive system: 保壓系; 正系統(tǒng)symmetric closed system: 對(duì)稱封閉系統(tǒng)下載手機(jī)詞典可隨時(shí)隨地查詞查翻譯