砰．砰，砰，三声轻轻敲门声。“准？”没应。隔有两三秒，砰．砰，砰，又是三声，匀速。礼貌．只是较前稍重些。我去开门。进来的是位白发苍苍、戴着圈儿套圈儿眼镜的老妪，她彬彬有礼地说“打扰了”就找该换的拖鞋。“您是…··，？”’我问。她刚从严寒的室外进来，镜片上 boom. Bang, bang, triple knock on the door. “Excuse me?” After two or three seconds, bang. Bang, bang, but also three times, uniform. courtesy. Just slightly heavier than before. I’m going to open the door. Come in is a gray-haired, wearing a circle of children in the circle of old glasses, she politely said that “disturbed” to find the change of slippers. “You are ...,?” "I ask. She had just come in from the cold outside, on the lens