At first, it determines the rate of obsolescence of technical knowledge and R&D lagged time with the ways that compute the stock of technical knowledge in foreign countries.

根据国外技术知识存量的计算方法，确定了技术知识的陈腐化率和R&D时间滞后。

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He singled out technical obsolescence as his single-best source of short-selling ideas over the last 10 years.

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