nod assent; 首肯
He did not agree until I had talked to him for a long time. 我劝说了半天,他才肯了。
be willing to help others; 肯帮助人
be ready to beat one's brains; 肯动脑筋
牛津高阶第八版
美国韦氏词典
Dictionary.com
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维基百科 (自由的百科全书)