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派生 originally（ad. 最初）
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perpetual［pər’peʧuəl］a. 连续不断的；永久的；长期的
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例句 1. With the rise of temperature, the perpetual snow of the Arctic began to melt. 随着气温的上升，北极终年不化的积雪开始融化了。
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2. The willingness of both you and your friends to continue your friendship will make it a perpetual one. 你和你的朋友继续保持友谊的意愿会让你们的友谊地久天长。
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physiology［ˌfizi’ɑ
:ləʤi］n. 生理学；生理机能
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例句 The physiology of endothermy makes sustained physical activity possible, for example running. 恒温动物的生理机能使持续的身体活动成为可能，比如跑动。
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plague［pleig］n. 瘟疫，传染病；祸患 v. 烦扰，使苦恼
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例句 If the trees are cut down, bats will have no place to roost, and there won’t be any animals to kill harmful insects that plague the crops in this area. 如果这些树都被砍伐掉，蝙蝠就没有了栖息之地，那么这个地区就没有任何动物来捕杀祸害农作物的害虫了。
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同义 epidemic（n. 传染病）
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predation［pri’deiʃn］n. 掠夺；掠食
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例句 1. The two competing theories—the predation theory and the pollution theory—both explained why the population of this species declined dramatically. 这两个相互竞争的理论——掠食者理论和污染理论——都解释了为何该物种的种群数量出现了如此剧烈的下降。
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2. One of the explanations why they live in trees is to protect themselves from predation. 其中一个为何这种动物生活在树上的解释是保护自己不被掠食。
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predator［‘predətər］n. 食肉动物；捕食者
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例句 1. These otters may not be killed by disease for it is so hard to find dead sea otters; this fact is consistent with the predator hypothesis. 因为很难找到死去的海獭的尸体，因此它们或许不是死于疾病；这一事实与捕食者假说一致。
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2. Some birds elevate their nests in high trees just to escape from predators. 一些鸟在很高的树上筑巢就是为了躲避食肉动物。
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preserve［pri’zə
:rv］n. 保护；维护；保存
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例句 1. Finally, the preserved building offers an important clue for historians to study the history of this city. 最终，保存下来的建筑为历史学家们提供了研究这座城市历史的一个重要线索。
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2. It is stupid for the government to construct new buildings without preserving the artifacts. 政府在建造新建筑时疏于保护工艺品的做法是愚蠢的。
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3. It is a village where traditions of the past are preserved for visitors. 这个村子将过去的传统为游客保留了下来。
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派生 preservation（n. 保存，存留）
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要点 preserve不但可以表示保护某些事物，还可以表示维护某种状态，比如：We made every effort to preserve peace. 或者：Government should preserve the rights of people.
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prevent［pri’vent］v. 阻止，妨碍
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搭配 prevent from doing sth. 阻止做某事
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例句 Nowadays, the advanced technology can prevent cancer from developing. 如今，先进的技术可以阻止癌症的恶化。
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proceed［prou’si
:d］v. 进行；发生；继续
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