If you know a man's last name, address him as 'Mr.'.
如果你知道一个男性的姓, 应该用 'Mr。' 来称呼他。
Hans returned to his family home, but the house had been bombed and no one in the neighbourhood knew what had become of the inhabitants.
汉斯重返故里,但他的家已被炸毁,左邻右舍谁也不知原住户的下落,