unaided eye 托福

Flashing microtext that, when viewed with the unaided eye, appears to be part of the line design, bet under magnification is seen as a repeated pattern of words, codes or numbers.

通过使用微缩文，加防伪特征。闪烁的微缩文，在没有使用放大镜的情况下，看到的只是一条线，在使用放大镜观看时，可以看到连续重复的文、编码及数等。