他们正在研究狼在数量上的变化。

They are studying the change of the number of wolves.

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这一人口变化带来的结果是，60岁以上的人在数量和比例上持续增加。

This demographic change has resulted in increasing Numbers and proportions of people who are over 60.

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此外，将需要讨论的各种因素决定价格的变化在数量上的需求和变化的个人电脑的需求。

Also, there will be need to discuss the various factors determining prices in relation to change in quantity demanded and change in demand of personal computers.

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