年龄结构的英文：
age structure

age是什么意思：
n. 年龄；时代，时期；年龄段
v. 长大，变老

This is a bulletin on aging.
这是关于老龄问题的期刊。

They are close in age.
他们年龄相仿。

It will be a production that will be handed on from age to age.
这将是传世之作。

Attach importance to the problem of population aging (an aging population )
重视老龄化问题

One has reached the age of no doubting—forty years of age
年登不惑

structure是什么意思：
n. 结构；构造；建筑物
v. 构造；组织

Involved or intricate, as in structure; complicated.
复杂的在结构中牵扯较多的或错综复杂的；复杂的

equiaxed grain structure
等轴结晶构造

The bridge is a frail wooden structure.
这座桥的木质结构，很不结实。

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

The structure will prove weak in service.
该构件在使用中将被证明是不牢固的。