慢速英语:想当宇航员吗？美国宇航局可能在找你

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regular – adj. happening repeatedly over a period of time

mission – n. a task or job that someone is given to do

apply – v. ask officially for something, usually in writing

follow suit – phr v. to do the same thing as someone else has done

graduate – v. to complete an education successfully at a college or university

boil it down – phr v. to reduce or summarize

mechanic – n. person whose job it is to repair machines

practical – adj. relating to real situations or actions and not to thoughts or ideas