副词短语
中文翻译：一次又一次地
同义词：
['once more', 'repeatedly例句：1. She repeated the story to her friend once and again.（她一再地向朋友复述这个故事。）2. The teacher asked the students to repeat the lesson once and again.（老师要求学生们一遍又一遍地复习这个课程。）3. He tried to explain the concept once and again', 'but it was still unclear.（他一再试图解释这个概念，但仍然不清楚。）']
例句：
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1. She repeated the story to her friend once and again.
她一再地向朋友复述这个故事。
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2. The teacher asked the students to repeat the lesson once and again.
老师要求学生们一遍又一遍地复习这个课程。
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3. He tried to explain the concept once and again, but it was still unclear.
他一再试图解释这个概念，但仍然不清楚。