The paper introduces a design method of power-grid operation ticket.

该文提出了一种电网操作票管理系统的设计方法。

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That piece of paper he found on the floor was a return ticket.

他在地板上捡到的那张纸是一张往返车票。

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That piece of paper he found on the floor was a return ticket.

他在地板上捡到的那张纸是一张往返车票。

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