Lines of motion, such as the one she used, are a very recent invention in the history of illustration.

她使用的这种运动线条在绘图史上也是最近才被发明出来。

Moreover, I wanted to discover whether there were differences in how the blind and the sighted interpreted lines of motion.

另外，我也想弄清盲人和视力正常者在描述运动曲线方式上的区别。

So I decided to test whether various lines of motion were apt ways of showing movement or if they were merely idiosyncratic marks.

所以我决定测试一下是不是各种运动线条都适于表现运动，抑或曲线只是惯常的符号而已？

Evidently, however, the blind not only figured out meanings for each line of motion, but as a group they generally came up with the same meaning at least as frequently as did sighted subjects.

然而，非常明显的是，盲人不仅识别出了每种运动线条，而且从整体来看，他们与视觉正常者的解释也是一致的。