Native applications built in Objective-C make full use of all the iPhone features: GPS, accelerometer, local storage, camera and more.
用Objective - C语言创建的本地应用程序能完全使用iPhone的所有功能：GPS、加速器、本地存储、照相机等。
Photographs depict objective realities that already exist, though only the camera can disclose them.
照片描绘业已存在的客观现实，不过只有造相机才能揭示这种客观现实。
An image with intersection lines between grating planes and a known objective plane can be captured by a digital camera.
将光栅投影到已知目标平面，通过数字摄影得到光栅平面与目标平面相交的光栅图像。
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