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lubrication by oil circulation

英 [ˌluːbrɪˈkeɪʃn baɪ ɔɪl ˌsɜːkjəˈleɪʃn] 美 [ˌluːbrɪˈkeɪʃn baɪ ɔɪl ˌsɜːrkjəˈleɪʃn]

油循环润滑

化学

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