1 . Petty officers are the backboneof a navy.

军士是海军的骨干。

来自柯林斯例句

2 . Agriculture forms the backboneof the rural economy.

农业是农村经济的基础。

来自《权威词典》

3 . The wounded soldiers showed much backbonebefore the enemy.

受伤的士兵在敌人面前表现出了威武不屈的精神.

来自《简明英汉词典》

4 . Agriculture used to be the economic backboneof this country.

农业曾是这个国家的经济支柱.

来自《简明英汉词典》

5 . Standing up to bullies takes plenty of backbone.

勇敢地对付暴徒需有大无畏精神.

来自《简明英汉词典》

1.a central cohesive source of support and stability;

faith is his anchor

2.fortitude and determination;

he didn't have the guts to try it

3.the series of vertebrae forming the axis of the skeleton and protecting the spinal cord;

the fall broke his back

4.the part of a network that connects other networks together;

the backbone is the part of a communication network that carries the heaviest traffic