为了提高我的中文水平，我每天都要苦练四个小时。
wèile tígāo wǒde zhōngwén shuǐpíng ， wǒ měitiān dūyào kǔ liàn sì gè xiǎoshí 。
In order to improve my Chinese level, I have to practice hard for four hours every day.
他从小就苦练武术，现在已经是一个高手了。
tā cóngxiǎojiù kǔ liànwǔshù ， xiànzài yǐjīng shì yígè gāoshǒu le 。
He practiced martial arts hard since he was young, and now he is already a master.
为了能在比赛中获胜，我们必须苦练每一个动作。
wèile néng zài bǐsài zhōng huòshèng ， wǒmen bìxū kǔ liàn měi yígè dòngzuò 。
In order to win the competition, we must practice hard every move.