VOA慢速英语:美国宇航局宇航员为首次私人太空发射做最后准备

mission – n. an important task, usually involving travel somewhere

humbling – adj. not proud or arrogant

inspire – v. to make someone feel that they want to do something and can do it

maintenance – n. work that is done to keep something in good condition

setback – n. a problem that makes something happen later or more slowly than it should