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Update receiptroot.rst #12

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2 changes: 1 addition & 1 deletion ch4/receiptroot.rst
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若我们取出收据树中的一个节点并放大来仔细查看，则一个节点就是一次交易的收据。
交易 **收据** (transaction receipt)是一个键值对映射，它的 **键** 是交易的编号，它的 **值** 是 RLP 编码过的四个域：交易后的状态、交易实际花费的交易费、交易产生的日志集合、日志的索引结构组成。

在实际应用中，在本区块内的数笔交易都顺利执行完毕后，也产生了数笔相对应的交易收据，由 MPT 树组织起来，计算得出根哈希值，称为receiptsRoot **交易树** ，该值将进入区块头部被永久保留。所有收据和对应着收据的日志将被存于世界各地以太坊节点计算机的数据库里，方便客户进行查询。
在实际应用中，在本区块内的数笔交易都顺利执行完毕后，也产生了数笔相对应的交易收据，由 MPT 树组织起来，计算得出根哈希值，称为receiptsRoot **收据树** ，该值将进入区块头部被永久保留。所有收据和对应着收据的日志将被存于世界各地以太坊节点计算机的数据库里，方便客户进行查询。