The census results show that big changes have taken place in the population's age composition .

这次人口普查反映出中国人口年龄结构发生了较大变化。

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Different case classifications had different age composition.

病例分型不同，年龄构成不同。

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The age composition and growth of Cerithidea cingulatus in Ningbo Coast are reported.

报道了宁波沿海珠带拟蟹守螺种群的年龄组成与生长情况 。

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Many of the people that will contribute to it have already been born, so short of some catastrophe that kills off large numbers of people, or some Viagra-fuelled leap in birth rates, population numbers and age composition can be predicted with fair accuracy for decades ahead.

ECONOMIST: Demographics: Greying globe | The

Using a combination of modern physics tools--including three-dimensional, high-resolution X-ray, radiocarbon dating with accelerator mass spectrometry, and infrared spectroscopy--the researchers analysed the tooth to determine the age and composition of a resinous filling detected inside.

UNESCO: Basic Sciences

That's because the sound they make depends on their age, size and chemical composition.

BBC: Team records 'music' from stars