Birders can generally identify every species on their life list, though they may consult with numerous field guides for certainty.

尽管他们有时也要通过众多观鸟指南的参考来确定，但鸟人通常可以确认他们自己的鸟种清单上每一个鸟种。

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They may not be easy to identify with complete certainty.

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While it is impossible to identify the firm with certainty, court documents suggest it is an atypical phone company.

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The hope of policymakers until recently was that research would identify precursor signals that could predict earthquakes with near certainty.

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