慢速英语:NASA Developing Food Bars for Mars Flights
日期:2016-12-12
Words in This Story
trash – n. items already used, to be thrown away
stow – v. to pack or store carefully and neatly
commercially-available – adj. something that can be bought in a store or market
shelf life – n. the length of time food may be stored and still be good to eat
mission – n. a task or flight that someone is given to do
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