骨干
activists;backbone activists;core (or key)member;mainstay
領(lǐng)導(dǎo)～ mainstay of the leadership;core leadership;key leaders/堅(jiān)決的～分子backbone die-hard elements/右翼～ nucleus of the right wing/～隊(duì)伍backbone contingent;backbone/～企業(yè)key (or backbone)enterprise/～項(xiàng)目key project/～作用act as the mainstay;play a major role