sea change
noun [ C ] literary uk/ˈsiː ˌtʃeɪndʒ/ us/ˈsiː ˌtʃeɪndʒ/
彻底变化
a complete change
There will have to be a sea change in people's attitudes if public transport is ever to replace the private car. 要想使公共交通有一天取代私家车，人们的观念必须彻底改变。
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