Charles Lyell made a good estimate of the Tertiary Period from the fossil record, but his method could not be extended to earlier geological periods.

查尔斯·莱尔根据化石记录对第三纪作出了很好的估计，但他的方法不能扩展到更早的地质时期。

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On the other hand, works with some taint—the wrong period, wrong colour, wrong size, wrong estimate—have a much tougher time finding buyers.

换言之，那些有点小毛病的作品，要么时机不对，要么色彩欠佳，要么大小不合适，要么估价错误，想得到买家的青睐可就难得多了。

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Therefore, our conservative estimate for the TCO is 12,400,000 over a thirty-six month period.

因此我们对TCO的合理估计是12,400,000，在36个月的期限内。

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There could be an upside of 15% to our price estimate if the iPhone market share exceeds our current end-of-period estimate by about 4 percentage points.

FORBES: iPhone 5 Success Could Launch Apple Past $850

We can estimate the period of these oscillations, and this red giant doesn't show that period.

BBC: Kepler star trio find is mystery to astroseismologists

The annualized income installment method is exactly like it sounds on the tin: it allows taxpayers to annualize tax for each period based on an estimate of income and deductions rather than in equal installments.

FORBES: Taxes From A To Z (2013): A Is For Annualized Income Installment Method