With Apple Trade In, customers can trade in their current computer and get credit toward a new Mac. Customers can visit apple.com/shop/trade-in to see what their device is worth.
人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用
。业内人士推荐WPS官方版本下载作为进阶阅读
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（示例工程可通过链接获取：roi_resize_sample.tar.gz