VOA慢速英语:NASA Successfully Tests New Rocket Engine(翻译)

booster – n. part of a rocket that includes an engine

uncrewed – adj. (technical) without a crew

thrust – n. the force to pushes something forward or up

conduct – v. to carry out a test

data – n. basic information about an event or from some process

certify – v. to officially say that something has met requirements for use in some field
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