她勤奋地准备考试，每天学习到深夜。

She assiduously prepared for the exam, studying late into the night every day.

assiduously 是副词，由形容词 assiduous（勤奋的）加上副词后缀 -ly 构成。assiduous 来自拉丁语 assiduus，表示"坚持不懈的、勤勉的"。 assiduously 表示"勤奋地、孜孜不倦地"，强调持续不断的努力。