backbone /'bækbəʊn/：the backbone of sth the most important part of an organization or group of people某事物的骨干（主力，中坚）:
•Farmers are the backbone of this community.农场主是这个社区的支柱。
3. Ucourage and determination骨气，毅力:
•Stuart doesn't have the backbone to be a good manager.斯图尔特不具备一个优秀管理人员应有的毅力。