Cleaner production process of the alcohol enterprise is a complex feedback system which involves the improvement of process, the reuse of circulating cooling water, sludge and so on.

酒精企业的清洁生产涉及到工艺流程的改进、循环冷却水、糟泥等的资源化利用等各方面，是一个复杂的反馈系统。

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GarageBand.com's complex technology ranks songs based on the community feedback.

FORBES: Podcasting Profits

Real-time 3D body motion data enables the development of apps that can recognize and classify complex motions such as sports techniques by digitizing your exact movements for immediate feedback and live sharing.

ENGADGET: Xsens teases wearable 3D body sensors that won't cost, will track an arm and a leg (video)

Complex systems such as climate and the financial markets have both positive and negative feedback.

FORBES: Chaos Theory, Financial Markets, and Global Weirding