及早发现销售警示讯号 Red Sign
这是植物发出的讯号，在警示说这系统出了问题还有大气的某些运作使它不能适应了。
That plant is indicating that it's not doing too well and that the atmosphere has become somehow unfit for it.
他说，泡沫警示标志是一种快于指数增长的讯号，由产生非线性增长的正反馈机制造成。
The telltale sign of a bubble, he says, is a faster than exponential growth rate caused by a positive feedback mechanism that generates this nonlinear growth.
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