find out the hard way meaning in English

经历一番艰苦才学到、理解..

Dante : flock off , feather face ! or you can stick around and find out the hard way
但丁：降下来啊，小鸟！或者你就想死在上面？
I have found out the hard way that automated testing is absolutely required when writing compilers
我已经发现在编写编译器时绝对需要自动化测试，但这种自动化测试的过程是艰难的。
The nuggets ( 24 - 16 ) found out the hard way that the lakers won ' t merely pack it in for the next two months , even as another injury was added to their growing stable of wounded
掘金的战绩则变为了24胜16负，本想利用湖人霉运当头的他们却发现今天的对手打得依然强硬，即使接下来的两个月前景堪忧，但是湖人的队员们依然是一幅风雨无阻之势。