这句话的意思是：越困难就越要努力。

这句话的英文表达可以是："The harder the challenge, the harder one should try."

这句话的来源可能源自一种传统的英语俗语，即"Where there's a will, there's a way."（有志者事竟成），意思是说，只要有决心，就一定能成功。这句话提醒我们，想要实现某些目标，就必须持之以恒地努力。

下面是一些英文例句，并提供中文翻译：

"I know this math problem is difficult, but I'm not going to give up. The harder the challenge, the harder I'll try." (我知道这道数学题很难，但我不会放弃。越困难就越要努力。)
"She's been training for the marathon for months. The harder the challenge, the harder she works." (她已经为马拉松训练了几个月。越困难就越要努力。)
"He knew that getting into a top university would be difficult, but he was determined to try his best. The harder the challenge, the harder he studied." (他知道进入一流大学会很困难，但他决心尽力而为。越困难就越要努力。)