“Diligent study” in Japanese
Short answer
Diligent study in Japanese is “研鑽” (kensan). Full meaning: diligent study, devoting oneself to one's studies.
Other ways to say “Diligent study” in Japanese
蛍雪
keisetsu diligence in studying (e.g. continuing to study even in such poor light as offered by a firefly or that reflected by snow), diligent study
研鑚
kensan diligent study, devoting oneself to one's studies
研さん
kensan diligent study, devoting oneself to one's studies
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