Introducing yet another screen size would mean that three versions of iOS, Apple's mobile operating system, would then be in circulation, each with its own developer needs.

推出另一个屏幕尺寸意味着要有三种苹果操作系统iOS的版本在流通，因为各自有各自的开发商需求。

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It also presents the design principle for embedded window system and three key technology which are message driving, screen managing and resource managing.

同时，该设计还论述了嵌入式窗口系统的设计原理，并分析了三项关键的设计技术：消息驱动机制、屏幕管理技术和资源管理技术。

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An automatic pneumatic control panel operates the SCREEN PULSE system on up to three shakers simultaneously.

SCREEN PULSE系统通过自动气控面板操作，最多可同时控制三台振动筛。

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