对于first response对象，其实是在Application中那个第一个接受系统事件的对象，如键盘事件(key events)，动作事件(motion events)，以及action消息。在此不做介绍。
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key events in evolution 进化论的要素
text key events 字事件
Expanded key events 键盘事件
modular key events 模块化关键事件
Intercepting hardware key events- 拦截实体键盘按钮事件
Key events method 关键事件法
Key Events of Principality 公国大事记
key-events 键盘事件
What key events influenced the energy situation in 1979?
是哪些关键性事件影响了1979年的能源状况?
没有键盘事件(至今)。
Logs are typically only used to report the key events in the life of the system.
日志一般只用来报告系统生命期内的重要事件。
This was the key decision which made possible all the other events leading up to the collapse of the Berlin Wall,".
VOA: standard.2009.11.03
Clinton will first visit Mumbai, India's business capital, for various events before going to New Delhi Sunday to meet key officials including Prime Minister Manmohan Singh and Congress Party leader Sonia Gandhi.
VOA: standard.2009.07.15
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