持之以恒地刻苦学习 study assiduously and perseveringly
刻苦认真地学习数学 study math really hard
刻苦地学
Study hard
以上为机器翻译结果，长、整句建议使用 人工翻译 。
汤姆刻苦地学了两年德语。
Tom fagged (away) at German for two years.
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玛雅以更加刻苦地学习来提高她糟糕的分数。
Maya dealt with her poor grades by studying harder.
为了打下坚实的基础，他们刻苦地学习英语。
In order to lay a solid foundation they work hard at English.
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