太空旅行的英语短语

　　We have learned and mastered space travel.

　　这时地球人已经学会并掌握了太空飞行。

　　Pioneer John Glenn was a pioneer in space travel.

　　约翰·格伦是太空飞行的先驱者。

　　Many companies are pursuing commercialized space travel.

　　许多公司在追求把太空旅行商业化。