A broch is a huge Iron Age structure made completely of dry stone with walls five metres thick.
Broch 是铁器时代一个巨大的建筑，完全由干燥的石头制成，墙壁厚 5 米。
Age structure
原声例句
Reel知识卷轴
TED演讲（视频版）双语精选
You can see how top heavy the population's age structure is here and how in the next few years it will grow even more so that way.
这里大家看到的是一个头重脚轻的人口年龄结构，在接下来的几年里这个状况还将加剧。
魔鬼经济学
EGGLESTON: Second, and more related to what I usually study, is that the population age structure in Japan is such that it's leading the world in the demographic transition.
埃格尔斯顿：其次， 与我通常研究的内容更相关的是，日本的人口年龄结构在人口结构转变方面处于世界领先地位。
精选英语短文
" That would be true except for the inverted age structure (more old people than young people) and all the uniformly negative consequences of an inverted age structure, " says Prof Murray.
默里教授说：“除了倒置的年龄结构（老年人多于年轻人）以及倒置的年龄结构带来的所有负面影响之外，情况确实如此。”
英语百科
Population pyramid
A population pyramid, also called an age pyramid or age picture diagram, is a graphical illustration that shows the distribution of various age groups in a population (typically that of a country or region of the world), which forms the shape of a pyramid when the population is growing. It is also used in ecology to determine the overall age distribution of a population; an indication of the reproductive capabilities and likelihood of the continuation of a species.
- fundamental conjecture的意思
- fundamental conjunction的意思
- fundamental connective的意思
- Fundamental constant的意思
- Fundamental Constants的意思
- fundamental construction的意思
- fundamental construction clearance的意思
- fundamental construction clearance, fundamental structure gauge的意思
- fundamental convention的意思
- fundamental conventions的意思
- fundamental coordinate system的意思
- fundamental cost的意思
- Fundamental Counting Principle的意思
- fundamental crystal的意思
- fundamental crystal plane的意思
- fundamental current的意思
- fundamental curve的意思
- Fundamental cutset的意思
- fundamental cut set的意思
- Fundamental cycle的意思
- fundamental data的意思
- fundamental deficit的意思
- fundamental design的意思
- fundamental determinant的意思
- fundamental deviation的意思