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corn
n.小麦; 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.
奥加拉拉蓄水层支撑了北美大平原地区棉花、高粱、小麦、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.
研究人员至少分析了兰花科的50种不同芳烃化合物，每种都会吸引一种，最多几种昆虫或飞禽。
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.
克鲁马努人洞穴绘画已有约2.7万年的历史，一手支撑洞穴，一手绘画的外轮廓一览无遗。
branches-branch
n.树枝 v.分支
Walking or leaping species of a similar or even larger size access the outer twigs
同类的行走或者跳跃性的物种通过将树枝要断在拾起来，
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.
或者用尾巴和脚将树枝拉下来在用手摘取的方法觅食。
block
n.街区；石块；阻碍v.阻塞；封锁
Such a quantity of material would have blocked the sunlight completely from reaching the surface,
如此大量的物质存在于大气层中，将会完全阻隔阳光的照射，
plunging earth into a period of cold and darkness that lasted at least several months.
于是地球一瞬间进入了一个持续数月之久的寒冷黑暗时期。
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.
世界上大多数伟大的建筑都是石料建筑，因为石料建筑不仅外形漂亮、持久耐用，而且石头随处可得。
attacked-attack
n.攻击 v.抨击
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.
裸露的岩石遭受着不断变化天气的攻击，逐渐被碾成碎石块带走，然后形成沉积岩。
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，妇女们在家中通常也会兼职从事一些生产活动，将商业资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.
化石包括一个完整原始动物的头盖骨，它的主人是现代鲸类的祖先。
alder
n.赤杨
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.
即便地面还有残雪，高的灌木也会露出来；风雪天气会把雪松、铁衫、红桤木和其它乔木多叶的树枝带下来。
accelerated-accelerate
v.使加速；加快
This is usually followed by the drying of the soil and accelerated erosion.
通常，随之而来的就是土地硬化和加速侵蚀。
wells-well
n.井
The first wells were drilled into the Ogallala during the drought years of the early 1930's.
20世纪30年代初，奥加拉拉正处于干旱时期，人们打出了第一口井。
viewed-view
n.视野, 见解v.看, 视察
Increasingly, too, schools were viewed as the most important means of integrating immigrants into American society.
久而久之，人们已将学校看成移民融入美国社会的重要方式。
upon
prep.在...之上
Industrialization and the bureaucratization of economic line life combined with a new emphasis upon
工业化和经济生活的官僚化，加上重新强调证书和专长，
credentials and expertise to make schooling increasingly important for economic and social mobility.
使得学校教育对经济和社会变动性越来越重要。
string
n.弦
Wind and string players may lap or scrape their instruments.
管弦乐器演奏者轻敲或清扫乐器。
silver
n.银, 银器adj.银的
silversmiths-silversmith
n.银器匠
In addition to plates and bowls, some customers sought more intricate products, such as silver teapots.
除了盘子和碗，许多顾客会寻找一些如银制茶壶等精致物品。
