经过北极地区的候鸟数量平均下降了6%，尽管“急剧增加”的某些迁徙大雁种群使这个数据有所偏差。

Migratory birds that pass through the Arctic have decreased an average of 6 percent, although that number is skewed by a "dramatic increase" in some populations of migratory geese.

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如果把实验面向相同体型的人，这个数据将会下降。

Adjusting the experiment to only include people of equal size, that number dropped.

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然后为每个工人的小时数做了调整。这个数据一直在下降，很大程度上是因为非全日制就业最近的上升。

Then adjust for hours per worker, which have been declining, largely because of the recent rise of part-time employment.

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