这确保不会将一个Buy事件与多个Sell事件配对，从而避免导致重复的SellAfterBuy操作。
This ensures that one Buy is not paired with multiple Sell events, which would cause repeated SellAfterBuy actions.
限制性进入机制符合非随机配对的要求，并有利于建立重复博弈和信任机制，有利于契约管理。
The restricted access mechanism meets the request of nonrandom matching and is favorable for setting up repeated game and trust mechanism and also favors contract management.
方法探讨单组重复采样设计及配对重复采样设计的成本效益评价。
Methods Evaluations of cost-benefit for one group repeated sampling data and pairing design of repeated sampling have been explored.
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