平均球迷花费$25–根据票价和纪念品的一个保守估计。
The average fan spends $25 – a conservative estimate based on ticket price and souvenirs.
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.
相比之下，由于沉积作用在大陆地区的连续性要小得多，因此根据已知的上下岩层的年龄来估计一个大陆岩层的年龄风险更大。
By contrast, because sedimentation is much less continuous in continental regions, estimating the age of a continental bed from the known ages of beds above and below is more risky.
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