Because the partno field is declared unique, repeated upload operations of the same part number merely replace the old index record with a new record.
由于声明了partno字段惟一，因此重复上传同一个部件号将只用新记录替换旧索引记录。
Each index record contains a five-byte header that may be preceded by a variable-length header.
每个索引记录包含一个五字节的头，在它之前还有一个变长的头。
Index searches are used to start range scans, single index record fetches, and to reposition within an index.
索引搜索用于启动范围扫描和单个索引记录提取以及在索引中改变位置。
Number of index searches. Index searches are used to start range scans, single index record fetches, and to reposition within an index.
索引搜索的数目。索引搜索用于启动范围扫描和单个索引记录提取以及在索引中改变位置。
Security index: record temperature, respiration, pulse and BP 1 time before and after taking the medicine;
安全性指标观测：用药前后各记录一次体温、呼吸、脉搏、血压；
Security index: record temperature, respiration, pulse and BP 1 time before and after taking the medicine;
安全性指标观测：用药前后各记录一次体温、呼吸、脉搏、血压；
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