They are studying the changes in their Numbers.

他们在研究它们数字上的变化。

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The members of the Birdwatching Club are studying the different kinds of birds and the changes in their numbers.

观鸟俱乐部的成员们正在研究不同种类的鸟以及它们数量上的变化。

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This year, members of our Birdwatching Club are studying the different kinds of birds in Zhalong and the changes in their Numbers.

今年我们观鸟俱乐部的正在研究扎龙地区的各种鸟类及它们的数量变化。

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While we knew that some people could not afford to make the home purchases that they did, we did not recognize that their numbers would be swelled by the simultaneous lowering of underwriting standards, changes in accounting rules and a slowing economy diminishing the income potential of both new buyers and current owners.

FORBES: Briefing Book: A. Michael Lipper