both courteous and helpful
...ysis, action research and lessons-learned law research methods, such as 既有礼貌又乐于助人 » Both courteous and helpful 越来越多的汽车进入家庭 » More and more car into the family ..
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both courteous and helpful
彬彬有礼，乐于助人
以上为机器翻译结果，长、整句建议使用 人工翻译 。