These coils are normally used to select slices for creating three-dimensional images, but the magnetic fields they create can also be used to exert a force on a small magnetic object inside a scanner.
这些线圈通常用于选择建立三维图像的切片，但是它们所建立的磁场也能被用来在扫描仪内部的小磁性物体上施加作用。
Open the Barcode Scanner and select the menu button on your Android phone.
打开“条形码扫描器”，点击屏幕上的“菜单”(menu)按钮。
When Barcode Scanner is finished reading and identifying the QR code, select Open Browser.
当“条形码阅读器”成功读取并识别二维码后，选择“打开浏览器（Open Browser）”。
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