短語(yǔ)詞組短語(yǔ)external air source 外部氣源external heat source 外來的熱源external radiation source 躰外輻射源external noise source 外界噪聲源steam external heating source 對(duì)外供熱汽源external voltage source 外部電壓源external clock source 外部時(shí)鍾源;外部時(shí)鍾信號(hào)源external perimysium source 外部信源 返回 external source