求翻译：At just 9.3mm, the iPhone 4 is thin as a rake but the front and back are 30 times stronger than the usual plastic. Reason - aluminosilicate glass, the stuff that windshields of military choppers are made of. The periphery of this Apple smartphone is customized alloy, 5 times stronger than steel. Your accidental dropping will not hurt the world’s thinnest smartphone yet. The Retina Display packs in 4 times the amount of pixels (326 per inch) of iPhone 3, and makes the text and images slicing sharp. Add a 960 x 640 pixel screen and watching HD movies on this Apple smartphone becomes a gasp. When you become a shutterbug behind the iPhone 4 camera, you shoot 5 megapixel images and high-definition videos at 720p resolution, with the LED flash and autofocus making things easier. With Wi-Fi, the FaceTime feature of this 5-megapixel phone gets you into true worldwide video chat and ‘staying in touch’ becomes real personal. And all it takes to choose between the front and rear camera on the iPhone 4 is a tap. The 3-axis gyro, when coupled with accelerometer, results in 6-axis motion sensing, and that is as good as it can ever get for gaming on a cell phone. With 7 hours of talk time (3G)/10 hours of video/40 hours of audio, this 5-megapixel phone packs in enough power to let you do fast multitasking and then some more 是什么意思？

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