本文讨论了资源环境项的使用，它是作为对特定于环境的应用程序变量使用属性文件或部署描述符文件的一种代替方法。
This article discussed the use of resource environment entries as an alternative to using properties files or deployment descriptor files for environment-specific application variables.
包含MDB的EJB模块的部署描述符必须定义此环境变量。
The deployment descriptor for the EJB module containing the MDB must define the environment variable.
到这时，用户可以编写shell脚本，在变量中存储信息和导出信息，控制文件描述符，控制信号处理，使用for循环和case语句，以及其他大量功能。
Now, users could write shell scripts; store and export information in variables; control file descriptors; control signal handling, for loops, and case statements; and so much more.
在清单6所示的代码中，缺省值派生自一个EJB环境变量，该变量是在包含MDB的EJB模块的部署描述符中设置的。
In the code show in Listing 6, the default value is derived from an EJB environment variable set in the deployment descriptor of the EJB module containing the MDB.
建立定量构效关系模型第一步是计算大量的分子描述符，下一步则是对这些描述符进行变量选择。
The first step in building a QSAR model is to calculate a great number of molecular descriptors, then the second is to select the descriptors most correlated to the studied object.
建立定量构效关系模型第一步是计算大量的分子描述符，下一步则是对这些描述符进行变量选择。
The first step in building a QSAR model is to calculate a great number of molecular descriptors, then the second is to select the descriptors most correlated to the studied object.
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