A rich content and system of knowledge, mature research methods in dendrohydrology provide accurate methods for studying long-term hydrologic variability at regional scale.

树木年代学丰富的内容和知识体系，成熟的研究方法，为区域尺度上研究水文变化提供了精确的方法。

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Climate change is all about long term trends, which are hard to detect in a weather record which has very large natural variability.

气候变化是长期的，我们不能用一种天气情况来判断说有大的气候自然变异。

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The negative correlation between the interannual variability of IODM and that of SCS summer monsoon is significant during the warm phase of long-term trend but insignificant during the cool phase.

二者年际变化的负相关关系在长期趋势的冷位相期不显著，而在暖位相期显著。

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These are long-term government bonds and I--now these are--since they're long-term, they have some uncertainty and variability to them.

这些是长期政府债券,由于它们是长期的，就存在不确定性和变化性。

耶鲁公开课 - 金融市场课程节选

If peak acidities rather than long-term averages are what matters most, natural variability could make things worse.

ECONOMIST: Ocean acidification

And while businesses should never try and encourage addiction, the fact is that like slots, technology products with finite variability do not form long-term habits in most users.

FORBES: Where Have All The Users Gone?

The programme aims to maintain a network of at least 3, 000 Argo floats, over all ocean areas without ice-cover, to study ocean variability in the long term.

UNESCO: World Water Assessment Programme (WWAP)