The third group has letters that are partly written below the lower line.
第三组的字母中的一部分写在下一行的下面。
For the entire group, the mean acuity decrease at 1 year was only 1.3 letters.
在整个观察组中，在1年中的平均视力下降为1.3个字符。
Which group of the letters is different from others?
哪一组字母在分类上与其它不一样？
Which group of the letters is different from others?
哪一组字母在分类上与其它不一样？
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