男人心千层针女人心海底针
[nán rén xīn qiān céng zhēn nǚ rén xīn hăi dĭ zhēn]
A man’s heart is like a thousand-layer needle, a woman’s heart like one lost under the sea.This Chinese idiom describes how hard it is to fathom men’s thoughts while understanding women’s inner emotions is extremely difficult too