骨干的英文：
backbone
diaphysis

They are the backbone of the party.
他们是政党的骨干。

He's an enormous asset to the team
他是队里的骨干

He's an enormous asset to the team.
他是队的骨干.

Composite, standing grain, legumina have absolutely predominance make of the backbone of floristic.
菊科、禾本科、豆科占有绝对优势，构成植物区系的骨干。

Making the ornamented rhythm, which was tightly packed with notes, a smoothed down and concise skeleton.
把原来装饰性的、音符稠密的旋律紧缩精炼为骨干音。

Some young and energetic cadre can take on the job now; I think I've done my whack.
现在该让哪位年富力强的骨干来承担这项工作了；我想我已尽了自己的本分。

They are the backbone of the party.
他们是政党的骨干。

He has no backbone.
他缺少毅力。

These men are the backbone of the country.
这些人是国家的中坚力量。

The backbone is an articulate structure.
脊椎骨是一种关节相连的结构。

They are the backbone of the scientific and technological contingents.
他们是科技队伍的骨干力量。