This is typically used when there is intervening user interface interaction and database locking in itself is not sufficient.
这通常用在当存在居间用户界面交互和数据库锁定不足的时候。
The enterprise beans control access to the back-end data and internally manage the current transactions and database locking.
企业bean控制对后端数据的访问，并且在内部管理当前事务和数据库锁定。
The EJB components control the access to the back-end data and manage the current transactions and database locking internally.
EJB组件控制着对后台数据的访问，并管理着当前事务以及数据库的内部锁定。
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