the small central group in an organization, or in a particular group of people, who are the most active or who will not change their beliefs or behaviour核心力量;骨干;中坚力量
It’s really only the hard core that bother(s) to go to meetings.也只有那些骨干分子愿意去开会。
A hard core of drivers ignore(s) the law.部分顽固的驾车人无视这项法律。
A hard core of supporters, mostly teenage girls, gathered at the airport to see the star arrive.支持者的中坚分子大多是十几岁的女孩子,聚集在机场一睹这位明星的到来。