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step change

noun
🔊/ˈstep tʃeɪndʒ/
🔊/ˈstep tʃeɪndʒ/
[usually singular] (British English)
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  1. a big change or improvement in something巨大变化；显著进步（或改善）
    • His speech called for a step change in attitudes to the environment in the 21st century.他的演讲呼吁在 21 世纪彻底改变对待环境的态度。🔊🔊