Fidelity技术公司已获得挪威武装部队的模拟器合同，该模拟器是专为训练前进空中引导员和观察员设计的。
Fidelity Technologies Corp. has been awarded a contract by the Norwegian Armed Forces for a simulator to train forward air controllers and forward observers.
我搜索的设计模式在我的题目和观察员可以在任何时间改变，但我失败了。
I have searched design patterns where my subject and observer can be changed at any time, but I failed.
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