短語(yǔ)詞組短語(yǔ)step step by step 英語(yǔ)step p by step 逐步地step -by antomatic telephone system 步進(jìn)式自動(dòng)電話制step by step switch 步進(jìn)開(kāi)關(guān)step by step exchange 步進(jìn)式電話交換侷;步進(jìn)式 返回 step by step