刻苦的英文：
hardworking
assiduous

Laborious study or meditation.
刻苦的学习勤奋的学习或思考

She's been plugging away at her French lessons for months.
她已刻苦攻读法语数月。

But Hunter worked so hard that he overstrained his heart.
但是，亨特工作十分刻苦以致心脏过于劳累。

And, withal, a life of privation, isolation, abnegation, chastity, with never a diversion
同时，他一生刻苦、独居克己、制欲，从来不曾娱乐过。

Able to bear and to suffer hardship
耐劳刻苦

Build up a family by hard work and thrift
刻苦成家

My sister is diligent in studying English.
我妹妹刻苦学习英语。

grind for an exam
用功[刻苦学习]准备考试

She made an elaborate study of Shakespeare's works.
她刻苦研究莎士比亚的著作。

During the trial period, he worked very hard.
试用期内，他工作非常刻苦。

He is, so to speak, a hardworking student.
他可说是个用功的学生。

To acquirethe wisdom means to possess natural endowments and hardworking.
要取得智慧，应具备天资，应努力学习。

It is widely known that the overseas Chinese are a hardworking lot.
众所周知华侨是刻苦耐劳的。

Martha's son is a hardworking, intelligent young man.
玛莎的儿子是个努力工作又聪明的年轻人。

He is clever, to be sure, but not very hard-working.
他聪明是聪明，但是不怎麽勤奋。

He was as ever assiduous and gallant.
他象以往一样殷勤周到，曲意温存。

To rise with the crow of cocks—assiduity and early rising
鸡鸣而起

The book was the result of ten years' assiduous research.
那本书是十年苦心钻研的成果。

He runs around only with those who are assiduous in their studies.
他总是跟那些学习认真的同学在一起。

We were amused to see how assiduously the animal groomed its fur.
看着这只动物如此认真地梳理自己的毛，我们被逗乐了。