nitrogen
n.氮
The Earth's atmosphere, by comparison, is mainly nitrogen, with a fair amount 5 of oxygen as well.
比较而言，地球大气主要由氮气组成，氧气只占5%。
melting-melt
v.融化;溶化
The resulting internal heat keeps what would otherwise be ice melted almost to the surface.
由于内热，冰会从内融化到表面。
landscape
n.风景，地容地貌
Los Angeles was a decentralized metropolis, sprawling across the desert landscape over an area of 400 square miles.
洛杉矶为“分权”城市，自然景观跨越沙漠，绵延400公里。
evolution
n.进化，进展
evolutionary
adj.发展的;渐进的
They are an example of a common theme in evolution, the more or less parallel development of different types of body structure and function for the same reason-in this case, for flight.
它们是进化的普通案例，不同身体结构或功能因飞行而平行发展。
eventually
adv.最后;终于
The earliest pterosaurs arose near the end of the Triassic period of the Mesozoic Era, some 70 million years before the first known fossils of true birds occur,
在中生代三叠纪末，早期翼龙异军突起，这比人类最早知道的鸟类化石早了约7000万年，
and they presumably dominated the skies until they were eventually displaced by birds.
在最终被鸟类取代之前，它们一直占据统治地位。
distinguished-distinguish
v.区别...;辨认出
Still, the proclivity to play hot distinguished the jazz musician from other instrumentalists.
尽管这样，倾向于玩热律的爵士音乐家比其它乐器家更出名。
core
n.争论的核心，果心
Their composition is thought to he similar to that of Earth's iron core and indeed they might have once made up the core of a large planetoid that disintegrated long ago.
人们认为这一构成与地球铁芯相似，它们也或曾是小行星的重要核心，且在很久已经就已分解。
composed-compose
v.组成，作曲
composition
n.写作;作品
composers-composer
n.作曲家，设计者
They are composed of iron and nickel along with sulfur, carbon, and traces of other elements.
除了硫磺，碳等其它元素，该物质还包含了铁和镍。
volcanic
adj.火山的
volcanoes-volcano
n.火山
These hominids walked across a stretch of moist volcanic ash, which was subsequently turned to mud by rain, and which then set like concrete.
这些类人动物走过潮湿的火山灰，经过连绵大雨，火山灰变成了泥浆并点燃。
vast
adj.巨大的，非常的
When heated, the mixture becomes soft and malleable and can be formed by various techniques into a vast array of shapes and sizes.
当热量增加，混合物变软可塑，也可通过各种技艺塑造成各种形状，大小。
trail
n.痕迹;足迹
When a bloodhound trails a human being, what does it actually smell?
当寻血猎犬追踪人类踪迹，它真正闻到了什么?
The human body, which consists of about 60 trillion living cells, sheds exposed skin at a rate of 50 million cells a day.
人体包含约60万亿活细胞，裸露皮肤以每天5000万个细胞的速度脱落。
renaissance
n.复活，文艺复兴
The Harlem Renaissance, a movement of the 1920's, marked the twentieth century's first period of intense activity by African Americans
20世纪20年代，哈莱姆文艺复兴运动是非洲裔美国人本世纪第一次“激烈活动”，
in the field of literature, art, and music in the United States.
领域涵盖文学、艺术以及音乐。
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