不同于竞争对手的产品，iPhone保持了苹果一贯的风格——面板上只有一个功能按键。
Unlike rival products-but in keeping with Apple's approach-the iPhone's front panel has only one mechanical button.
外壳上设置有操控面板，操控面板上设置有液晶显示屏和功能按键以及电源开关。
The housing is provided with an operation control panel which is provided with a liquid crystal display screen and a function key as well as a power switch.
另外，本文对不同形状和功能的操作面板上的按键系统的实现进行了深入的研究，并在文中展示了本虚拟数控系统设计的按键。
Another characterastis of this article is a deep introductory on the key of various types and functions which are on the operation panel. What's more, it displays the key of virtual NC system.
另外，本文对不同形状和功能的操作面板上的按键系统的实现进行了深入的研究，并在文中展示了本虚拟数控系统设计的按键。
Another characterastis of this article is a deep introductory on the key of various types and functions which are on the operation panel. What's more, it displays the key of virtual NC system.
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