radical
/ˈrædəkəl/
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adj./n. 徹底的；激進的；激進分子
- Closing the main street to cars every weekend is a radical change that the mayor proposed last month. 每個週末讓主要街道禁止汽車通行，是市長上個月提出的一項徹底改變。
其他意思
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adj. 激進的, 根本的
Radical changes and differences are very important and great in degree.
- The country needs a period of calm without more surges of radical change
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n. 激進分子
A radical is someone who has radical views.
也出現在：
字根
radic 根
radic + al根 + 形容詞