网友回答：
a lecture on space flightA Lecture on Space Fli，yesterday i borrowed several books on space from the school library. i want to be a space scientist in the future.
温馨提醒：随时光变迁，文中所陈述观点；准确性、难免有所变动，因此文中观点仅供参考。
a lecture on space flightA Lecture on Space Fli，yesterday i borrowed several books on space from the school library. i want to be a space scientist in the future.
