Because the EJB's transaction isolation level is set in its deployment descriptor, the same EJB could be reused in different applications with different transaction isolation levels.

因为EJB的事务隔离级别是在部署描述符中设置的，所以具有不同事务隔离级别的不同应用程序可以重用同一个EJB。

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After developing an EJB, the programmer must set deployment descriptors that define characteristics, such as transaction support and isolation levels for the EJB.

开发了EJB后，程序员必须设置定义各种特征(如ejb的事务支持和隔离级别)的部署描述符。

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Isolation: JPA 1.0 doesn't support custom isolation levels, so developers are required to specify the default transaction isolation level on the database side.

isolation： JPA 1.0不支持自定义隔离级别，因此开发人员需要指定数据库端的默认事务隔离级别。

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