hot button
noun [ C ] US informal uk/ˈhɒt ˌbʌt.ən/ us/ˈhɑːt ˌbʌt̬.ən/
重要而敏感的问题
a subject that is important to people and about which they have strong opinions
Gender issues have become something of a hot button. 性别问题在某种程度上已经变成了一个敏感问题。
Immigration has become a hot button issue. 移民问题现在已经变得非常敏感。