首先介绍了大型数据库系统的定时机制原理，然后阐述了用数据库系统实现定时控制的优势。

This paper introduces the principle of timing control based on large database management system, and describes its superiority.

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尼康坚持使用传统的2.7英寸液晶屏，有单独的按钮控制各种功能，如菜单、定时器、删除和回放。

The Nikon sticks to one traditional 2.7-inch LCD screen with separate buttons that control functions like menu, timer, deleting and playback.

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您还可以编制一个定时器来控制这些动作的顺序。

You can program timers to sequence those actions.

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