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revolution
n.革命, 旋转
revolutionary
adj.革命的, 革命性的
It appeared that Canada was once more falling in step with the trend toward smaller families
这显示出加拿大再次出现向小规模家庭发展的趋势，
that had occurred all through the Western world since the time of the Industrial.
这是自工业革命时期以来西方社会都已经出现过的趋势。
prey
n.被掠食者, 牺牲者v.捕食
When other predators such as the gray wolf prey upon large mammals, they generally take high proportions of each year s crop of young.
当其他的肉食动物，比如灰狼，捕食大型哺乳动物的时候，幼崽捕猎比例较高。
microscope
n.显微镜
microscopic
adj.用显微镜可见的
The invention of the visible-light microscope late in the sixteenth century introduced a previously unknown realm of single-celled plants and animals.
16世纪，光学显微镜发明成功，此项发明揭开了人们对未知动植物的了解。
metal
n.金属, 合金
metallic
adj.金属的, 产生金属的
metalworkers-metalworker
n.制金属品工人
A brass or woodwind player may hum while playing, to produce two pitches at once; a pianist may reach inside the piano to pluck a string and then run a metal blade along it.
铜管和木管乐手会在弹奏时哼唱，一次敲击两个音调；钢琴家也有可能用金属铜片拨动钢琴线。
helium
n.氦
Jupiter and the other giant planets are of a low-density type quite distinct from the terrestrial planets:
木星等其它天体为低密度星体，与类地行星有明显不同，
they are composed predominantly of such substances as hydrogen, helium, ammonia, and methane, unlike terrestrial planets.
不同于类地行星，它们主要由氮气、氦气、氨气、沼气等物质组成。
frame
n.框；结构v.构成；制定
The carpenter's shop probably provided the frame and perhaps supplied the panel, and yet another shop supplied the gold.
木匠店可能会提供木架和嵌板，而另一家店或许还会提供黄金制品。
continent
n.大陆, 陆地
continental
adj.大陆的, 洲的
supercontinent
n.超大陆
When this supercontinent started to tear apart because of plate movement, Pangaea first broke into two large continental masses with a newly formed sea
由于版块运动，超大陆开始分崩离析，泛大陆首先分离成两块大陆，
that grew between the land areas as the depression filled with water.
随着版块下陷，两大陆之间形成海洋。
contemporary
n.同时代的人adj.同时代的
Granite may be found on the surface of the contemporary landscape, but from its coarse texture we know
人们可以在当代景观中发现花岗岩，但透过它粗糙的表面可以得知，
that it must have formed through slow cooling at a great depth and later been laid bare by erosion.
它先是在深层中缓慢冷却，之后通过腐蚀研磨平整。
claims-claim
v.要求; 声称
An oak tree is a good example of a competitor.
橡树是典型的“竞争者”。
A massive oak claims its ground for 200 years or more, outcompeting all other would-be canopy trees by casting a dense shade and drawing up any free water in the soil.
一颗巨大的橡树占据它的领地长达200年甚至更久，通过制造浓密的树荫和吸收土壤中任何多余水分驱逐所有可能的冠层树木。
tension
n.紧张, 拉紧
The same forces that create surface tension in any sample of water are responsible for the maintenance of these unbroken columns of water.
在任何水样中造成表面张力的力支持着这些不断的水柱。
task
n.作业；任务
Each product had its own peculiar characteristics that demanded a particular way of cutting or drying the meat,
每种产品都有它自己的特点，需要用不同方法干燥或剪切，
and each task required its own cutting blades and other utensils.
也需要使用独特的切刀和器具。
stimulated-stimulate
v.刺激, 鼓舞
stimulation
n.激励; 刺激
Cheap transportation networks, the rise of cities, and the availability of capital and credit all stimulated the shift to factory production.
廉价的交通运输网络、城市的兴起和资本借贷的可行性都促进了制造业从手工作坊到工厂生产的转变。
spread
n.传播, 伸展, 散布 v.使伸展, 使延伸
Growing human populations and the agricultural demands that come with such growth have upset the ecological balance in some areas and led to the spread of deserts.
随着人口不断增长，农业需求扩大，地区生态失衡，土地沙漠化扩大。
