这些名词均含有行为，举止之意。
behavior : 普通用词，侧重指某人在特定场合对他人或在他人面前的行为、举止。
Her husband felt ashamed at her behavior. （她丈夫为她的行为感到害臊。）
conduct : 较正式用词，泛指某人的行动。侧重根据社会道德标准和责任感。
He is famous for his good conduct. （他因良好的行为而远近闻名。）
manner : 主要用来指人的习惯行为。
Their manners were still more vivacious than before.（他们的举止也比以前更生动。）
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