上世纪90年代，许多经济学家开始将混沌理论视为一种提供预测模型的方法。

In the 1990s, many economists began to look at chaos theory as a way of providing models for forecasting.

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19世纪90年代，出现说大脑会产生随机的噪音，然后又不能用确定性混沌理论描述。

In the 1990s, it emerged that the brain generates random noise, and hence cannot be described by deterministic chaos.

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自70年代后期以来，混沌系统的研究成为科学界热点问题之一，受到数学、物理、力学科研工作者的广泛重视。

Since the later of 70's, the research of the chaos systems has become one of the hot problem of scientific fields, received the extensive attention of mathematics, physics, mechanics researcher.

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