If product life span is short and consequently the duopoly competition is mainly a preemption game,no matter whether R&D costs are high or low.是什么意思_If product life span is short and consequently the duopoly competition is mainly a preemption game,no matter whether R&D costs are high or low.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句