老头子开头定睛望着他儿子,不自然地咧着嘴微笑,露出安德烈公爵至今尚未看惯的牙齿中间的新豁口。
The old man stared for a moment at his son , and a forced smile revealed the loss of a tooth , to which Prince Andrey could not get accustomed , in his face .