learn by hard
努力学习
以上为机器翻译结果，长、整句建议使用 人工翻译 。
youdao
What they mean is that by working hard, a person can learn skills that differentiate him from other people, and earn for himself whatever he desires.
他们的意思是，通过辛勤的劳动，一个人可以学到使他与众不同的技巧，这样无论他想要什么都可以得到。
You learn the hard way. You learn by your mistakes.
你犯了错才学会。
Once you've been dumped by a favorite website it can be hard to learn how to trust again.
CNN: What to do when your favorite site closes
One of the criticisms levied by lighterweight, cloud-based competitors is that SUP is hard to learn and deploy.
FORBES: The Mobile Developer's Preview of SAP TechEd (and Sybase TechWave) 2011
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