苦功的英文：
hard work; painstaking effort
- 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。 - Because the Chinese language is harder to learn and master except for the stout-hearted.
因为中文是一种较难学，较难驾驭的语文，除了肯下一番苦功去学的人。 - I said flatly it was not worth my while to face the grind since I was not going in for teaching.
我老实回答她，既然我将来不打算教书，就犯不上下这番苦功。
adj. 硬的，坚固的；困难的；有力的；冷酷无情的
adv. 努力地；困难地；严重地，猛烈地
- It is hard to conclude.
这很难断定。 - It is blowing hard.
风刮得很大。 - It was sleeting hard.
雨雪霏霏。
n. 工作；职业；工厂；工作地点；产品；功；操作；作品；工程
v.（使）工作；操作；运作；起作用；使缓慢前进；经营
- the works of a clock
钟的活动部件 - conscientious work
本着良心做的工作 - The work is not advancing.
工作没有进展。
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。