These encode less information than their more sophisticated counterparts but can be used by people who own simpler mobile phones, because the image-recognition process is handled elsewhere.

这种条形码包含的信息要少于那些复杂的条形码，但却能让使用功能简单的手机的人也能读出，因为图像的识别过程并不由手机来完成。

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Second, the free-boundary is handled by using combination of the zero-velocity method with the general ghost-image method and fourth-order difference format is used in free-boundary.

然后采用将零速度法和广义虚像法相结合的方法来处理自由边界，并在自由边界上采用四阶精度差分格式；

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Native mobile apps are on the way but for now the service is accessible via smartphones and on iOS image capture is handled correctly.

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