Bird songs and calls as one of the most important features, which contain abundant biological information, are vital for the research of Avi-behavior, bird population structure and classification.

鸟类的鸣声中包含有丰富的生物学信息，研究鸣声对于了解鸣声与行为的关系、鸟类的种群结构及种属分类具有重要的实际意义。

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First, we examined consumption function model which doesn't contain the age structure of population variables and we conduct a brief analysis.

首先，我们检验了不含人口年龄结构变量的消费函数模型，并对结果进行了简要的分析。

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Last year, the team lowered the mosquito population by 90 percent during a trial using the same method and helped to contain a local outbreak of dengue fever.

去年，为了帮助控制局部暴发的登革热，该团队使用同样的方法在一个试点区域内将蚊子数量降低了90%。

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The report suggests that many countries will find it difficult to contain the costs of population ageing by making mandatory pensions less generous.

ECONOMIST: Ageing and public finances

Melissa Nobles, a political scientist at the Massachusetts Institute of Technology who specialises in apologology (our word), says that they can give official backing to a particular view of history, help contain political grievances peacefully and encourage public-spiritedness among alienated parts of the population.

ECONOMIST: Who should apologise to whom, for what and how?

The eight inland West states now contain six of the top ten fastest-growing states by job creation and population, and five of the ten states with the highest personal-income gains.

ECONOMIST: A new Republican heartland