After he graduated, he became a teacher as well as a researcher who studied rockets and missile theories.

毕业后，他成为了一名教师以及研究火箭和导弹理论的研究员。

youdao

After he graduated, he became a teacher as well as a researcher who studied rockets and missile theories.

毕业后，他成为了一名教师以及研究火箭和导弹理论的研究员。

youdao