基本解釋[電子、通信與自動控制技術(shù)]空閑行英漢例句雙語例句A plausible reason is that all the dinosaurs had been killed off, except the line that evolved into birds, and the placental mammals speciated into the ecological niches that had been left vacant.一個可能的原因是所有恐龍除進化爲鳥的一支外都死掉了，胎磐類哺乳動物才在被空閑出來的生態(tài)龕中得以進化。vacant line更多例句詞組短語短語vacant charge line 空料線line of vacant sites 空位線vacant line更多詞組專業(yè)釋義電子、通信與自動控制技術(shù)空閑行