Along with this optimistic estimate, I must in all candor leave one note of caution.

随同这个乐观的评估，我必须要完全坦白委托一个谨慎的照会。

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One optimistic estimate is that half the world's people might speak English by 2050.

一个乐观的估计是到2050年世界上大概有一半的人会说英语。

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Now in Baidu's share of the Japanese market, the most optimistic estimate is that 10 per cent.

百度如今在日本市场所占的份额，最乐观地估计也不到10%。

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Goldman Sachs's calculations suggest that, to reduce growth from 4% to 3%, (an optimistic estimate of America's new sustainable growth rate) the financial conditions index would need to increase by 1.25 percentage points.

ECONOMIST: Alan’s key | The

Even that is probably a wildly optimistic estimate.

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We are optimistic on our estimate largely because of the shift away from paper based transactions which will drive sales on credit cards and debit cards.

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