to learn by making mistakes or through difficult experiences
通过犯错或艰难的经验来学习 (tōngguò fàn cuò huò jiānnán de jīngyàn lái xuéxí)
"He learned the hard way that honesty is the best policy."
"他 通过艰难的方式学到 诚实是最好的政策。" (Tā **tōngguò jiānnán de fāngshì xué dào** chéngshí shì zuì hǎo de zhèngcè.)
the responsibility of developers and organizations to ensure...
to be declared healthy by a doctor
a short period when a chance is available
to be born into a rich family
signs of problems or weaknesses in a system or relationship
very content and comfortable
