backbone

courage, bravery, backbone, nerve

这些名词都可表示“勇气、胆量”之意。
courage: 普通用词。指面对危险或困难时无所畏惧的精神和敢于奋斗的进取心。
bravery: 指在危险中表现出的无所畏惧精神或在逆境中仍能坚持下去的毅力。
backbone: 指性格倔强，意志坚定，有骨气，有顽强的决心去做某事。
nerve: 侧重指面临危险或在冒险的情况下具有冷静、清醒的头脑和坚定无畏的勇气。

名词 backbone:

1. a central cohesive source of support and stability
   同义词：anchor, mainstay, keystone, linchpin, lynchpin
2. fortitude and determination
   同义词：grit, guts, moxie, sand, gumption
3. the series of vertebrae forming the axis of the skeleton and protecting the spinal cord
   同义词：spinal column, vertebral column, spine, back, rachis
4. the part of a book's cover that encloses the inner side of the book's pages and that faces outward when the book is shelved
   同义词：spine
5. the part of a network that connects other networks together

1. The backbone is an articulate structure.
   脊椎骨是一种关节相连的结构。
2. He has no backbone.
   他没有骨气。
3. These men are the backbone of the country.
   这些人是国家的中坚力量。