为了在打开时触发自动获取，要使用PostOpen事件，这个事件在当前文档被打开之后，但是在用户获得输入焦点之前发生。
In order to trigger an automatic retrieval upon opening, make use of the PostOpen event that occurs after the current document is opened, but before the user has input focus.
对焦速度与精度是自动对焦系统中最重要的两个参数，它们决定系统能否迅速地定位到焦点处，以获取清晰的图像。
The velocity and precision are two important aspects of the auto-focus system. They can decide whether the system can quickly locate the focusing point to obtain clear image.
对焦速度与精度是自动对焦系统中最重要的两个参数，它们决定系统能否迅速地定位到焦点处，以获取清晰的图像。
The velocity and precision are two important aspects of the auto-focus system. They can decide whether the system can quickly locate the focusing point to obtain clear image.
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