... tracing paper 描图纸; 透明纸 tracing pattern 曲线形态 tracing pen 描迹笔尖; 自记笔 ...
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Tracing-off a Pattern 复描纸样
Some are simple in their approach, such as the MotionCAPTCHA project that requires tracing a pattern with the mouse pointer or Capy, a service in beta for touch-based devices.
FORBES: Artificial Intelligence Will Defeat CAPTCHA -- How Will We Prove We're Human Then?
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