苦心的英文：
painstaking

参考例句：
  • They dig into the history of mankind
    他们苦心研究人类史。
  • The book was the result of ten years' assiduous research.
    那本书是十年苦心钻研的成果。
  • I saw him puzzle over a math problem.
    我看见他正在苦心思索一道数学题。
  • Add to that the good war of a born eavesdropper, carefully honed on a lot of strangers in foreign train compartments
    此外，他生就一对善于偷听的耳朵，经过在异国火车车厢里听众多陌生人谈话的苦心磨练，变得更灵敏。
painstaking是什么意思：
n. 辛苦；勤勉
adj. 辛苦的；勤勉的；小心的
  • The experts did a painstaking sifting of debris.
    专家们对岩屑进行了煞费苦心的研究。
  • Solvable or comprehensible only with painstaking effort.
    难理解的只有经过刻苦的努力才能解决或理解的
  • It was this painstaking apprenticeship that gave Van Gogh mastery of painting.
    这种辛勤的练习，使梵高精通了绘画技巧。
  • His painstaking to attain his goal in life is praiseworthy.
    他为实现人生目标所下的苦功是值得称赞的。
  • It also meant the beginning of obligation, painstaking, happiness and enjoyment.
    它同时也意味着责任、辛苦、幸福、快乐的开始。

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