most striking among the many asymmetries evident in an adult flatfish is eye placement：before maturity one eye migrates，so that in an adult flatfish both eyes are on the same side of the head. (3+)

在一条成年比目鱼身上显著存在的诸多不对称(asymmetry)特征中，最为吸人注目的是眼睛的摆位：在成年之前，一只眼睛发生移动，因此在成年比目鱼身上，两只眼睛均位于头部的同一侧面。

难句类型：

倒装、省略

解释：

本句的倒装本质上与我们早就的一种倒装结构是一样的，即形容词放在句首时，主语和谓语倒装。本句的主干的正常语序应该是：eye placement is most striking;倒装后成了most striking is eye placement。但是这种倒装在gre考试中出现，又有了新的特色，被提到句首的most striking被长长的状语among the many asymmetries evident in an adult flatfish与后面的主语和表语分开，造成阅读困难。

意群训练：

most striking among the many asymmetries evident in an adult flatfish is eye placement：before maturity one eye migrates，so that in an adult flatfish both eyes are on the same side of the head.