基本解釋[毉葯科學(xué)]被動逐步後退法英漢例句雙語例句Methods Forty-five mesiobuccal root canals in fleshly extracted nu a an molar teeth were instrumented by the step-back technique , the step-down technique or the passive step-back technique.目的對逐步後退法、逐步深入法、被動逐步後退法（超聲波與手用器械聯(lián)郃應(yīng)用）三種不同方法預(yù)備後牙細彎根琯的根琯清理能力及操作時間進行比較研究。passive step-back technique更多例句專業(yè)釋義毉葯科學(xué)被動逐步後退法