Recently planetary scientists have suggested that the external preconditions for the development of Earth's biosphere probably included four paramount contingencies.

最近，行星科学家提出，地球生物圈发展的外部先决条件可能包括四个最重要的偶发事件。

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Preconditions: Test preconditions for your methods more easily.

预置条件：使方法的条件检查更简单。

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The preconditions for application of this method are discussed.

本文从理论上分析了该方法的适用条件。

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It is range-of-the-moment, while rebuking others for not setting the preconditions for long-range planning.

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So Silicon Valley seems to be a place where all the preconditions for higher density are in place.

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The ecological preconditions for this unprecedented event were, of course, global warming -- another product of Big Oil.

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