Object: Identifies the data resource that is being locked.
对象：标识被锁定的数据资源。
A lock does not always have to control an entire data resource.
锁并不总是必须控制整个数据资源。
The database system is important data resource in agricultural expert system.
数据库系统是农业专家系统的重要数据资源。
The database system is important data resource in agricultural expert system.
数据库系统是农业专家系统的重要数据资源。
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