n.脊骨；骨干；骨气；毅力
They are the backbone of the party. 他们是政党的骨干。
These men are the backbone of the country. 这些人是国家的中坚力量。
He has no backbone. 他没有骨气。
He displayed grit and backbone in facing adversity. 他在面对逆境和苦难时显示出刚毅和勇气。
中轴骨
