无人迎候，应在门前按铃或轻轻敲门。按门铃时间不能太长（以两三秒为限），

无人迎候，应在门前按铃或轻轻敲门。按门铃时间不能太长（以两三秒为限），敲门以轻敲三下为好。如无人应声，可稍等片刻，再次按铃或敲门，需待主人开门，才可进入

結果 (英文) 1:

No one greeted, in front of the Bell or gently knocking at the door. Bell time is not too long (limited to two or three seconds), the knock at the door to tap three times as well. If no one crashed, wait a moment, Bell or knock again, needs to be the master door before entering the

結果 (英文) 2:

No one greeted, should ring the bell or knock at the door gently. Rang the bell time not too long (limited to twenty-three seconds), tap three times to knock on the door as well. As no one answered, you can wait a moment, the bell or knock on the door again, the need to wait for the host to open the door before entering

結果 (英文) 3:

No one to greet him, should be in front of the door bell or knock gently. The doorbell time not too long (up to two or three seconds), knock on the door to tap three down for good. If no one answered, can wait for a moment, once again the bell or knock on the door, after the owner opened the door, before entering