Therefore, multi-scale mechanics is introduced to study the phenomena that couple various length and time scales.

由此引入多尺度力学，即研究各种不同长度尺度和时间尺度相互耦合现象的科学。

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And normally we're talking about that on multi-decadal time scales, and longer, even centuries and millennium.

一般来说，我们谈论的这些数据的时间跨度有的几十年，有的几百年，有的甚至长达几千年。

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