这个突变在父母身上不存在，并且它也未在正常个体的其它地方发现。
The mutation is not present in the parents, and it has not been seen in any normal individual anywhere else.
目的：确定正常个体中上下眼睑周围泪河凹面的昼夜变化。
PURPOSE: To determine diurnal variation of tear menisci around upper and lower eyelids in normal subjects.
该研究领域对正常个体语篇理解的个体差异研究初见端倪，但尚未涉及特殊人群。
Preliminary research about individual differences pertaining to discourse comprehension has offered valuable clues, but special individuals' difference in this respect keeps untouched.
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