1. A low number of algal cells in the presence of a high number of grazers suggested，but did not prove， that the grazers　had removed most of the algae.
　　在存在大量食草動物的同時(shí)卻只有少量的水藻花粉囊，這暗示出——但沒能證明——食草動物已吞噬了大部分水藻。
　　大難句類型：插入語
　　解釋：本句主語很長，而且謂語suggested與that引導(dǎo)的賓語從句間被插入語but did not prove隔開，造成閱讀障礙。當(dāng)suggest與but did not prove連在一起使用的時(shí)候，其意思不是建議，而是指一種基于主觀臆測的推理，中文翻譯成“暗示”。其英文釋義為：to call to mind by though or association the explosion suggested sabotage。GRE、GMAT及LSAT文章中，常用suggest，but do not prove來描述一種沒有真憑實(shí)據(jù)、可能有問題的理論，然后在后面的敘述中把它否定掉。
　　意群訓(xùn)練：A low number of algal cells in the presence of a high number of grazers suggested，but did not prove， that the grazers　had removed most of the algae.
　　2. Perhaps the fact many of these first studies considered only algae of a size that could be collected in a net (net phytoplankton), a practice that overlooked the smaller phytoplankton (nannoplankton) that we now know grazers are most likely to feed on , led to a de-emphasis of the role of grazers in subsequent research.
　　可能這樣一個事實(shí)，那就是很多這樣的比較初的研究只是考慮了那些能夠用網(wǎng)撈起來的大小的水藻，這樣一個忽視了更小的浮游生物（而這些浮游生物我們現(xiàn)在知道是捕食者主要的食物）的做法，導(dǎo)致了在接下來的研究中對于捕食者的作用的貶低。
　　難句類型：復(fù)雜修飾、插入語
　　解釋：句子的結(jié)構(gòu)繁雜。句子的主語令人吃驚地長，在比較后一個逗號后的led以前，全是主語！其實(shí)句子的主干簡單，就是the fact led to a de-emphasis of the role of grazers。但是本句的主語the fact后面的修飾成分長得嚇人，先是個定語從句；定語從句中又套了一個定語從句。然后逗號后面的a practice引導(dǎo)的部分是前面的主語的同位語兼任插入語，practice后面的修飾它的一大堆東西又是定語從句套著定語從句。本句是典型的層層修飾結(jié)構(gòu)。
　　意群訓(xùn)練：Perhaps the fact that many of these first studies considered only algae of a size that could be collected in a net(net phytoplankton), a pratice that overlooked the smaller that we now know grazers are most likely to feed on, led to a de-emphasis of the role of grazers in subsequent research.