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.
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.
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.
九十年代中后期，科学家们从理论上和实验上发现在两台和三台单模耦合激光系统中，激光强度出现混沌同步的现象。
Since the mid and late of 1990's, many scientists discovered the phenomenon of chaotic intensity synchronization in a system of two or three single-mode lasers both theoretically and experimentally.
混沌现象广泛地存在于自然界，2 0世纪70年代以来，通过大量的生物模型模拟说明混沌也存在于生物系统中。
Chaos widely exist in nature and shows also exist in biological system by the iterations of biological models since 70's of 20 th century.
二十世纪80年代以来，用数字化混沌系统构造密码系统受到了越来越多的关注。
Since the 1980s, more and more attentions have been given to constructing a cipher system with digital chaotic system.
二十世纪80年代以来，用数字化混沌系统构造密码系统受到了越来越多的关注。
Since the 1980s, more and more attentions have been given to constructing a cipher system with digital chaotic system.
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