聚螢映雪 [ㄐㄩˋ ㄧㄥˊ ㄧㄥˋ ㄒㄩㄝˇ; ju4 ying2 ying4 xue3] lit. to collect fireflies and study by their light (idiom); fig. ambitious student from impoverished background burning the midnight oil ◄ ►
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