根据普雷蒂教授的说法，这是一个保守的估计。
According to Professor Pretty, it was a conservative estimate.
他表示，这是他个人保守的估计。
The projection was conservative and based on a personal estimate, he said.
随着经济急剧的下滑，这只是个保守的估计。
That could prove to be a conservative estimate, as the economic slowdown begins in earnest.
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