基本解釋[醫(yī)藥科學(xué)]被動逐步后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.目的對逐步后退法、逐步深入法、被動逐步后退法（超聲波與手用器械聯(lián)合應(yīng)用）三種不同方法預(yù)備后牙細(xì)彎根管的根管清理能力及操作時間進(jìn)行比較研究。passive step-back technique更多例句專業(yè)釋義醫(yī)藥科學(xué)被動逐步后退法