in service

US /ɪn 'sɝvɪs/

UK /in ˈsɜːvɪs/

B1 中級
adj.形容詞使用中
The elevator is in service again after repairs

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機會成本。一切的隱藏成本 (Opportunity Cost: The Hidden Cost of Everything)

03:31機會成本。一切的隱藏成本 (Opportunity Cost: The Hidden Cost of Everything)