well-mannered man; 谨小慎微的君子
He was even more cautious than ever, and did his utmost to win the trust and favour of the superior. 他更加谨小慎微,兢兢业业,以尽力取信讨好其上司。
牛津高阶第八版
美国韦氏词典
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维基百科 (自由的百科全书)