she dresses very modestly.

She dresses very modestly.

她衣着非常端庄。

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modest是个形容词，表示谦虚的（看下例）；也可表示恰当的，得体的，（衣着）端庄的。He is modest about his success.他在成功面前表现得很谦虚。
例句：
She wore a modest bathing suit.她穿一件不太暴露的游泳衣。