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.
失业人数达三百万是根据官方统计数据做出的一个保守估计。
The figure of three million unemployed is a conservative estimate based on government statistics.
失业人数达三百万是根据官方统计数据做出的一个保守估计。
The figure of three million unemployed is a conservative estimate based on government statistics.
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