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corn
n.小麥; 玉米
Ogallala water has enabled the High Plains region to supply significant amounts of the cotton, sorghum, wheat, and corn grown in the United States.
奧加拉拉蓄水層支撐了北美大平原地區棉花、高粱、小麥、玉米的灌溉需求。
compounds-compound
n.混合物 v.使化合；使混合adj.合成的
At least 50 different aromatic compounds have been analyzed in the orchid family, each blended to attract one or at most a few species of insects or birds.
研究人員至少分析了蘭花科的50種不同芳烴化合物，每種都會吸引一種，最多幾種昆蟲或飛禽。
commonly
adv.通常地
Cro-Magnon cave paintings some 27,000 years old commonly show outlines of human hands made by placing one hand against the cave wall and applying paint with the other.
克魯馬努人洞穴繪畫已有約2.7萬年的歷史，一手支撐洞穴，一手繪畫的外輪廓一覽無遺。
branches-branch
n.樹枝 v.分支
Walking or leaping species of a similar or even larger size access the outer twigs
同類的行走或者跳躍性的物種通過將樹枝要斷在拾起來，
either by snapping off and retrieving the whole branch or by clutching stiff branches with the feet or tail and plucking food with their hands.
或者用尾巴和腳將樹枝拉下來在用手摘取的方法覓食。
block
n.街區；石塊；阻礙v.阻塞；封鎖
Such a quantity of material would have blocked the sunlight completely from reaching the surface,
如此大量的物質存在于大氣層中，將會完全阻隔陽光的照射，
plunging earth into a period of cold and darkness that lasted at least several months.
于是地球一瞬間進入了一個持續數月之久的寒冷黑暗時期。
availability
n.有效; 可利用性
Much of the world's great architecture has been constructed of stone because of its beauty, permanence, and availability.
世界上大多數偉大的建筑都是石料建筑，因為石料建筑不僅外形漂亮、持久耐用，而且石頭隨處可得。
attacked-attack
n.攻擊 v.抨擊
The exposed rocks are attacked by the various weather processes and gradually broken down into fragments, which are then carried away and later deposited as sediments.
裸露的巖石遭受著不斷變化天氣的攻擊，逐漸被碾成碎石塊帶走，然后形成沉積巖。
articles-article
n.物品；文章
In addition, women often worked in their homes part-time, making finished articles from raw material supplied by merchant capitalists.
此外，婦女們在家中通常也會兼職從事一些生產活動，將商業資本家提供的原料制成成品。
ancestors-ancestor
n.祖先；原型
The fossil consists of a complete skull of an archaeocyte, an extinct group of ancestors of modern cetaceans.
化石包括一個完整原始動物的頭蓋骨，它的主人是現代鯨類的祖先。
alder
n.赤楊
Even with snow on the ground, the high bushy understory is exposed; also snow and wind bring down leafy branches of cedar, hemlock, red alder, and other arboreal fodder.
即便地面還有殘雪，高的灌木也會露出來；風雪天氣會把雪松、鐵衫、紅榿木和其它喬木多葉的樹枝帶下來。
accelerated-accelerate
v.使加速；加快
This is usually followed by the drying of the soil and accelerated erosion.
通常，隨之而來的就是土地硬化和加速侵蝕。
wells-well
n.井
The first wells were drilled into the Ogallala during the drought years of the early 1930's.
20世紀30年代初，奧加拉拉正處于干旱時期，人們打出了第一口井。
viewed-view
n.視野, 見解v.看, 視察
Increasingly, too, schools were viewed as the most important means of integrating immigrants into American society.
久而久之，人們已將學校看成移民融入美國社會的重要方式。
upon
prep.在...之上
Industrialization and the bureaucratization of economic line life combined with a new emphasis upon
工業化和經濟生活的官僚化，加上重新強調證書和專長，
credentials and expertise to make schooling increasingly important for economic and social mobility.
使得學校教育對經濟和社會變動性越來越重要。
string
n.弦
Wind and string players may lap or scrape their instruments.
管弦樂器演奏者輕敲或清掃樂器。
silver
n.銀, 銀器adj.銀的
silversmiths-silversmith
n.銀器匠
In addition to plates and bowls, some customers sought more intricate products, such as silver teapots.
除了盤子和碗，許多顧客會尋找一些如銀制茶壺等精致物品。
