苦练的英文：
to practice hard; to drill diligently

参考例句：

She had to learn and practice day and night without any breathing space, lest she should disappoint her mother.
她不得不日夜不停地苦练，以免使她的母亲失望。

He drives the team relentlessly.
他无情地鞭策全队苦练。

"I know no such thing as genius, it is nothing But labour and diligence"
世上无天才,勤学加苦练

It calls for rigorous and hard training to develop the ability to wipe out the enemy as required in actual combat.
要严格训练，要按实战要求苦练过硬的杀敌本领.

By much pains, the orator overcame a natural impediment in his speech.
这位演说家用苦练的方法克服了天生的口吃。

He had developed his unusual toughness by working out daily at a gymnasium.
他每天在体操房里顽强地苦练，终于练得非常强健。

practice是什么意思：
n. 实践；练习；业务；惯例；诊所；律师事务所
v. 练习；实习；惯常地进行；执业；实践，实行

A practicing attorney;a practicing Catholic.
开业律师；虔诚的天主教徒

a practicing physician; a practicing Catholic.
执业医师；虔诚的天主教徒。

practice a professio
从事某职业，开业

hard是什么意思：
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。

drill是什么意思：
n. 钻头，钻孔机；操练，演习；条播沟
v. 钻（孔）；钻探；操练，演习；条播

The worker was drilling.
此工人在用钻孔机钻孔。

Drilling is performed with a rotating tool called a drill.
钻孔是用一个称为“钻头”的旋转刀具进行的。

Can you teach me the drill?
你能教我正确的作法吗？