汉译英：他爸爸是桂林一家工厂的工程师。 涛涛没有兄弟和姐妹 他是一名数学教师 你的好朋友多大了？

His father is a engineer of a factory of Gui lin in China ,Taotao don't have brothers and sisters,he is a mathematics teacher .How old are your friend?