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+)

在一條成年比目魚身上顯著存在的諸多不對(duì)稱(asymmetry)特征中，最為吸人注目的是眼睛的擺位：在成年之前，一只眼睛發(fā)生移動(dòng)，因此在成年比目魚身上，兩只眼睛均位于頭部的同一側(cè)面。

難句類型：

倒裝、省略

解釋：

本句的倒裝本質(zhì)上與我們?cè)缇偷囊环N倒裝結(jié)構(gòu)是一樣的，即形容詞放在句首時(shí)，主語(yǔ)和謂語(yǔ)倒裝。本句的主干的正常語(yǔ)序應(yīng)該是：eye placement is most striking;倒裝后成了most striking is eye placement。但是這種倒裝在gre考試中出現(xiàn)，又有了新的特色，被提到句首的most striking被長(zhǎng)長(zhǎng)的狀語(yǔ)among the many asymmetries evident in an adult flatfish與后面的主語(yǔ)和表語(yǔ)分開，造成閱讀困難。

意群訓(xùn)練：

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.