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source
n.来源，根源
This unprecedented development of a finite groundwater resource with an almost negligible natural recharge rate—that is,
有限地下水无限开采，而自然补给量却微乎其微，
virtually no natural water source to replenish the water supply—has caused water tables in the region to fall drastically.
由于水资源无法补充，导致地下水迅速锐减。
environment
n.环境
environmentalists-environmentalist
n.环境保护论者
Many ecologists now think that the relative long-term stability of climax communities comes not from diversity but from the “patchiness” of the environment,
许多生态学家认为，顶极群落之所以能够保持相对稳定，并不是因为多样性，
an environment that varies from place to place supports more kinds of organisms than an environment that is uniform.
而是因为环境的不平均分布造成。环境千变万化，但就整体性而言，这种变化维持了生物体的生存。
period
n.时期
periodic
adj.定期的
periodically
adv.周期性地；偶尔
In the long run, electricity from large wind farms in remote areas might be used to make hydrogen gas from water during periods when there is less than peak demand for electricity.
从长远来讲，若电力需求不达峰值，风力发电厂可利用水生成氮气。
society
n.社会
Some theories of theater development focus on how theater was used by group leaders to group leaders govern other members of society.
许多剧院管理理论侧重于剧场使用，研究如何让剧场为社会领袖所用。
activities-activity
n.行动；活动
There is little doubt, however, that desertification in most areas results primarily from human activities rather than natural processes.
毋庸置疑，多地荒漠化现象主要来自人类活动，而非自然过程。
mass
n.块adj.大规模的
The cinema did not emerge as a form of mass consumption until its technology evolved from the initial "peepshow" format to the point where images were projected on a screen in a darkened theater.
随着西洋镜到暗幕图像的不断发展，大量电影院应运而生。
since
conj.因为，从...至今
Since the raising of most crops necessitates the prior removal of the natural vegetation, crop failures leave extensive tracts of land devoid of a plant cover and susceptible to wind and water erosion.
因种植玉米须提前移走天然植被，玉米种植失败致大片土地荒芜，遭强风暴雨侵蚀。
emotions-emotion
n.情绪
emotional
adj.情绪的
In psychodynamic theory, the purging of strong emotions or the relieving of tensions.
在心理动力学理论，情绪波动或神经放松。
communities-community
n.人群，很多个体的集合体，社 区
Each SMSA would contain at least one central city with 50,000 inhabitants or more or two cities having shared boundaries and constituting,
每个SMSA（大城市及其郊区）至少包含一个中心城市，5万或5万以上市民，或拥有两座城市，
for general economic and social purposes, a single community with a combined population of at least 50,000, the smaller of which must have a population of at least 15,000.
为了经济和社会发展，两座城市应享有共同法规，并在地里上彼此相连，单一社区人口至少为5万人，小城市至少拥有1.5万人。
organisms-organism
n.生物
microorganisms-microorganism
n.微生物
We can say that the properties of an ecosystem are more stable than the individual organisms that compose the ecosystem.
较单一生物系统而言，生态系统特性更加稳固。
process
n.过程 v.加工；处理，办理
In fact, damage to the environment by humans is often much more severe than damage by natural events and processes.
事实上，人类对环境的破坏要比自然过程更为严重。
individual
n.人，个体 adj.个别的
individualism
n.利己主义
Because each individual is short-lived, the population of an opportunist species is likely to be adversely affected by drought, bad winters, or floods.
个体生命短暂，机会主义物种往往受干旱、恶劣天气或洪涝影响。
effect
n.结果 v.造成
effective
adj.有效的
effectiveness
n.效力
But for the black-tailed deer, human pressure has had just the opposite effect.
但对于黑尾鹿来讲，人类压力适得其反。
