初級縊痕 primary constriction

　　zhiransetishangdefangchuisifuzhedian，jihanyouzhesilideyihen。yichengzhuyihen。zaigongnengshangshiweijuxianxingzhesili。youyuchujiyihendeweizhibutongransetichangyouyiding，suoyizheyekezuoweiransetizuxingfenxidezhongyaozhibiao。