基本解釋齒孔同根派生 perforations相關(guān)詞英漢例句Tear the sheet of stamps along the perforations.沿齒孔把郵票撕開。Grooves extend to the finished edge, but rear perforations are not visible.凹槽延伸到成品的優(yōu)勢(shì)，但后排齒孔中不可見。perforations更多例句