郑征于己于1997年晋升为教授。

Zhengzheng was promoted to professor in 1997 .

youdao

郑征于己于1997年晋升为教授。

Zhengzheng was promoted to professor in 1997.

youdao

郑征于己于1997年晋升为年龄大的老师。

Zhengzheng were promoted to professor in 1997.

youdao

郑征于己于1997年晋升为年龄大的老师。

Zhengzheng were promoted to professor in 1997.

youdao