在打印 500 张传单之前，请先打印一张。 在正常的室内光线下，用两部不同的手机，在手臂距离处扫描纸上的二维码。在屏幕上能正常扫描的代码在纸上并不总是有效：墨迹会扩散，颜色会变淡，纸张会反光。 如果能扫描成功，再打印剩下的。如果不能，请将二维码调大或增强颜色，然后再次尝试。
Before you print 500 flyers, print one. Scan it off the paper with two different phones, in normal room light, from arm's length. A code that works on your screen doesn't always work on paper: the ink spreads, the colours get paler, the paper shines. If it scans, print the rest. If it doesn't, make the code bigger or the colours stronger, and try again.
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