n.脊骨；骨干；骨氣；毅力
They are the backbone of the party. 他們是政黨的骨干。
These men are the backbone of the country. 這些人是國家的中堅(jiān)力量。
He has no backbone. 他沒有骨氣。
He displayed grit and backbone in facing adversity. 他在面對逆境和苦難時顯示出剛毅和勇氣。
中軸骨
