To study diligently and assiduously, often under difficult circumstances, by making the most of available light, like the reflection from snow or the glow of fireflies.
他年轻时家境贫寒，却凭着雪案萤窗的精神，最终学有所成，成为一名优秀的学者。
Though his family was poor in his youth, with the spirit of diligent study (like using a snowy desk and firefly window), he eventually achieved academic success and became an excellent scholar.
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