If the value is set to 0, then the optimizer chooses index scans over table scans if appropriate indexes exist, without even considering the estimated costs.

如果将其值设置为0，那么当存在合适的索引时，优化器就选择索引扫描而非表扫描，甚至不考虑估算成本。

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It is estimated around one in ten women suffers postnatal depression, even if they have never had mental health problems.

据估计，约十分之一的女性会患产后抑郁症，即使她们之前没有心理健康方面的问题。

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But it is estimated that, even if families only pay the expected 60% to 65% of the local market rate, those who depend on benefits will struggle.

但据估计，那些依赖房租补助家庭只能支付当地市场房租60%至65%。

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But even if asset returns are estimated accurately, the high expected return reflects the greater risk inherent in equity investments.

FORBES

The direct financial costs to industry can safely be said to be substantial even if they can not be estimated with precision at this time.

CENTERFORSECURITYPOLICY: Center for Security Policy | EXCERPTS OF TESTIMONY BY FRANK J. GAFFNEY, JR. before the SENATE ARMED SERVICES COMMITTEE

This week Gartner estimated that even if RIM's new phones are well received, the company won't reach 5% world-wide market share by the end of 2016.

WSJ: RIM to Launch New BlackBerry in U.S. Friday, Aims to Challenge Apple and Samsung