控制器 呈现 被执行的命令实例（Command Instance），命令实例在 Struts中就是Action，如图3.3所示。
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command instance
命令实例
以上为机器翻译结果，长、整句建议使用 人工翻译 。
We do have a unique capability, for instance around our intelligence, around our refueling capacity, around our ability to jam Libyan command and control, for instance.
WHITEHOUSE: Press Briefing with Jay Carney and Ben Rhodes
For instance, it should be possible to distinguish an insurgency with a rigid command structure from a group of smaller, randomly linked units.
ECONOMIST: Modelling conflict
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