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lift-off

noun
🔊/ˈlɪft ɒf/
🔊/ˈlɪft ɔːf/
 [countable, uncountable]
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  1. the act of a rocket or helicopter leaving the ground and rising into the air（航天器的）发射，起飞，升空
    • Ten minutes to lift-off.离发射还有十分钟。🔊🔊
    compare blast-offTopics Spacec2