به نقل از: Oxford Languages
a topic or issue that is highly charged emotionally or politically 
مثال:
"the hot - button issue of nuclear waste disposal" 
به نقل از
wiktionary 
idiomatic ) A central issue, concern or characteristic, especially one that motivates people to make a choice )   
... [مشاهده متن کامل]
idiomatic, marketing ) The principal desire that a salesman needs to "hit" in order to make a sale )  
idiomatic ) An emotional trigger; something that arouses strong emotion or opinions )  
مسئله ی اصلی
مسئله ی کانونی
مثال:
به نقل از
... [مشاهده متن کامل]
مسئله ی اصلی
مسئله ی کانونی
موضوعات حساس