硬道理yìngdàolǐ

指经得起检验的规律。何申《穷县》：“但郑德海终归是明白人，他认准乐极生悲是个～，好事多的时候别忘了夹尾巴。”

硬道理ying dao li

established truth

硬道理

absolute necessity;top priority;of overwhelming importance
发展是～。Development is an absolute necessity(or the top priority,of overwhelming importance).