《英漢醫(yī)學(xué)詞典》source film distance 焦點-底片距離 source-film distance: 焦點底片距離; 射線源source-to-film distance: 放射源底片間距離source-to-film distance(sfd): 焦距（射線源到膠片距離）source distance: 震源矩focus source distance: 焦源距下載手機詞典可隨時隨地查詞查翻譯
