They are relatively heavyweight objects with references to external OS resources (Figure 3).

图像是比较重量级的对象，具有对外部OS资源的引用(图3)。

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The z/OS external stored procedure runtime environment is managed by z/OS Workload Manager (WLM).

z/OS 外部存储过程运行时环境由 z/OS Workload Manager (WLM) 管理。

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Before attempting a major OS upgrade I first made sure I had a bootable backup of my current Snow Leopard install on an external firewire drive.

在打算进行有较大风险的OS升级之前，我先确保自己当前的Snow Leopard有一个安装在外部火线驱动器上的可启动的备份。

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