1. A critique of Handlin’s interpretation of why legal slavery did not appear until the 1660’s suggests that assumptions about the relation between slavery and racial prejudice should be reexamined , and that explanations for the different treatment of Black slaves in North and South America should be expanded .
　　一個對于H的關于為何法律上的奴隸制沒有在17世紀60年代以前出現(xiàn)的原因所作解釋的批評顯示，關于奴隸制和種族偏見之間的關系的假說應當重新檢查，而且顯示出，對于在北美和南美之間的對黑怒的不同處理的解釋應當被擴展。
　　難句類型：復雜修飾、省略
　　解釋：句子的主干清楚：A critique suggests that…, and suggests that…。但是因為句子的結構復雜、修飾成分多，再加上后面的and 之后的suggests被省略，所以句子的結構很難被讀出來的。
　　本句的suggest不再是暗示，而是顯示、說明的意思，其同義詞有point,indicate,imply。本句的兩個suggest之后的賓語從句都根據(jù)語法要求使用了虛擬語氣。
　　意群訓練：A critique of Handlin’s interpretation of why legal slavery did not appear until the 1660’s suggests that assumptions about the relation between slavery and racial prejudice should be reexamined , and that explanations for the different treatment of Black slaves in North and South America should be expanded .
　　2. The best evidence for the layered-mantle thesis is the well-established fact that volcanic rocks found on oceanic islands，islands believed to result from mantle plumes arising from the lower mantle，are composed of material fundamentally different from that of the mid-ocean ridge system， whose source，most　geologists contend，is the upper mantle.
　　對于地幔分層論點來說，比較好的證據(jù)乃這樣一個確認的事實，即在那些海洋島嶼——這些島嶼據(jù)信是源于由下層地幔升上來的地幔柱狀溶巖流（mantle plume）——上發(fā)現(xiàn)的火山巖石，是由與海洋中部山脊系統(tǒng)的物質(zhì)根本不同的物質(zhì)構成的，而這一海洋中部山脊系統(tǒng)的成因，大多數(shù)地質(zhì)學家論辯道，為上部地幔。
　　難句類型：復雜修飾、插入語
　　解釋：本句前面的主干并不算難，即the evidence is the fact that,難就難在fact之后說明fact 的同位語從句。此從句中既有大段插入語，又有從句，較為難讀。同位語從句的主語是volcanic rocks，主語后面的found on oceanic islands是分詞修飾volcanic rocks的；islands后面又有一個說明islands的同位語islands believed to result from mantle plumes arising from the lower mantle,此同位語實際起到一個分隔主謂的同位語的作用。其后是謂語動詞are composed/of fundamentally different from that of the midocean ridge system, whose source, most geologists contend, is the upper mantle。
　　句中有一些專有詞匯。如果拋開文章不說，單看這一個句子，則句首的layered mantle thesis就難以理解。但是如果讀者能夠讀懂句子的大致意思，看到layered mantle thesisr比較有力證據(jù)就是其材料fundamentally different from… the upper mantle,這應該可以推測出，既然不同于上層地幔，則這個理論一定是在說地幔有不同的層面。
　　意群訓練：The best evidence for the layered-mantle thesis is the well-established fact that volcanic rocks found on oceanic islands，islands believed to result from mantle plumes arising from the lower mantle，are composed of material fundamentally different from that of the mid-ocean ridge system， whose source，most　geologists contend，is the upper mantle.
　　3. Some geologists，however，on the basis of observations concerning mantle　xenoliths， argue that the mantle is　not layered，but that heterogeneity is created by fluids rich in "incompatible elements" （elements tending toward　liquid rather than solid state）percolating upward and transforming　portions of the upper mantle　irregularly，according to the vagaries of the fluids’ pathways.
　　但是，某些地質(zhì)學家，以對地幔捕虜巖體（xenolith）所作的觀察為依據(jù)，指出地幔并非是分層排列的，相反，地幔的異質(zhì)性是由那些富含“不相容成分”的流質(zhì)構成的，這些成分趨向于流體而非固體的狀態(tài)，自下而上滲透擴散，并依照這些流質(zhì)流向的任意性，不規(guī)則地將上部地幔的某些部分予以改變。
　　難句類型：復雜修飾、插入語
　　解釋：本句的主句中有一個長插入語however,on the basis of observations concerning mantle xenoliths,割裂了主謂，但句子的主要難度還是在that引導的賓語從句中，從句中有由but 所連接的兩個句子，一起延續(xù)到句末。首選是rich in incompatible elements修飾fluids；后面又有一個同位語和一個分詞結構，都是修飾incompatible elements的，比較后還有一個狀語來修飾那個分詞結構，層層修飾，比較復雜。
　　意群訓練：Some geologists，however，on the basis of observations concerning mantle　xenoliths， argue that the mantle is　not layered，but that heterogeneity is created by fluids rich in "incompatible elements" （elements tending toward　liquid rather than solid state）percolating upward and transforming　portions of the upper mantle　irregularly，according to the vagaries of the fluids’ pathways.