“人与机器竞争”这一概念至少与工业革命一样古老了，但在经济衰退期和脆弱的复苏期中，这种现象往往最为明显。

The concept of man versus machine is at least as old as the industrial revolution, but this phenomenon tends to be most acutely felt during economic downturns and fragile recoveries.

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通常说来，需要三年的经济复苏期股市才能上涨60%。

Normally, it takes three years of recovery before the market is up 60%.

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二叠纪末大灭绝之后，三叠纪初残存期和复苏期生态系研究成为当今热点。

The study of the ecosystems in the survival and recovery time in the Early Triassic following the end-Permian mass extinction becomes a hotspot.

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