然而，我们经常从现存的手稿数量来推断某一特定作品在中世纪的发行量。

Too often, though, too much is inferred about a particular work's circulation in the Middle Ages from the number of manuscripts surviving today.

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然而，从今天幸存的手稿数量来看，人们通常可以推断出中世纪某个特定的作品发行量。

Too often, though, too much is inferred about a particular works circulation in the Middle Ages from the number of manuscripts surviving today.

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但是，这一点很重要，它们的繁殖量与那些只有父方抚养幼儿的鸟类的数量相当。

But, and this is important, their clutch volumes matched those of birds that have only male parental care.

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