根据科斯·格洛夫的说法，平均而言，这种生产量是稳定的，意味着两个父母将被两个孩子取代。
On average, says Cosgrove, the yield is "stable," meaning that the two parents will be replaced by two children.
十一月中，北达科他州日平均生产212000桶原油；五年前，其日产量只有79000桶。
In November North Dakota produced an average of 212,000 barrels each day; five years earlier it produced 79,000 barrels a day.
表1 列有10种最重要的作物、其生产面积、过去3年它们的平均产量以及各自的产值（澳大利亚联邦，1991）。
Table 1 shows the 10 most important crops, their areas of production, their average yields of the last 3 years and their value of production (Comm. of Aust. 1991).
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