一旦人们了解了这些板块是如何运动的，就有可能确定过去地球上大陆的运动，以及这些缓慢的运动如何在不同时期重塑了地球的特征。
Once it was understood how these plates move, it was possible to determine past movements of Earth's continents and how these slow movements have reshaped Earth's features at different times.
位于阿巴拉契亚山脉和落基山脉之间的是世界上大陆长河之一——密西西比河。
Lying between the Appalachian Mountains and the Rocky Mountains is one of the world's great continental rivers — the Mississippi.
大家都知道地球上的大陆曾经连在一起，直到最近才分开的那个理论吗？
You know the theory that earth's continents were once joined together and only split apart relatively recently?
曾经生活在澳大利亚这片广袤大陆上的巨型动物经历了什么？
What happened to Australia's megafauna, the giant animals that once existed across this enormous continent?
在美洲大陆上，外来物种是在第一次接触欧洲后引进的。
Across the American continents, exotic species are those introduced after the first European contact.
当大陆上的冰开始融化时，两块冰原之间形成了一条无冰走廊，这一证据主要来自放射性碳测年法。
Evidence that an ice-free corridor between two ice sheets developed when the continental ice first began to melt came primarily from radiocarbon dating.
在强大而多样的动机驱使下，这次运动从荒野中建立起一个国家，并在本质上塑造了一个未知大陆的性格和命运。
This movement, driven by powerful and diverse motivations, built a nation out of a wilderness and, by its nature, shaped the character and destiny of an uncharted continent.
1912年，阿尔弗雷德·魏格纳在一个被称为“大陆漂移”的理论中提出，地球上的大陆是可移动的。
In 1912, Alfred Wegener proposed, in a widely debated theory that came to be called continental drift, that Earth's continents were mobile.
其他机制更可能是较为循序渐进的，在更长时间段或在不同的大陆上的不同时间发生。
Other mechanisms would be more likely to have taken place more gradually, over an extended period, or at different times on different continents.
白令海大陆架上的鲸鱼盗窃案发生得越来越频繁。
The frequency of whale fish theft in the Bering Sea's continental shelf is increasing.
他很有说服力地指出，直到很久以后，当大陆上的冰开始最后消退时，才有了这样一条没有冰的走廊。
He persuasively argued that such an ice-free corridor did not exist until much later, when the continental ice began its final retreat.
大陆上的浅海可能减轻了附近空气所受的影响，以保持其相对稳定的温度。
The shallow seas on the continents probably buffered the temperature of the nearby air, keeping it relatively constant.
蔗蜍本身变成了一种害虫，并且已经破坏了那片大陆上的很多野生动物。
The cane toad itself became a pest and has destroyed much of the wildlife on that continent.
当大陆板块停留在一个热点上时，从深层升起的物质就会形成一个广阔的圆顶。
When a continental plate come to rest over a hot spot, the material rising from deeper layer creates a broad dome.
从理论上讲，这种对流会把大陆板块带到一起，好像把它们放在传送带上一样。
Theoretically, this convection would carry the continental plates along as though they were on a conveyor belt.
驻扎在南极洲需要适应在地球上最干燥、风最大和最冷的大陆上生活。
Being stationed in Antarctica involves adapting to life on the planet's driest, windiest and coldest continent.
在欧亚大陆内部大草原上出现的马的游牧主义尤其如此，因为它是所有主要游牧形式中最具流动性的。
This is particularly true of the horse pastoralism that emerged in the Inner Eurasian steppes, for this was the most mobile of all major forms of pastoralism.
也许更早的时候，在欧亚大陆内部的大草原上就出现了独特的游牧文化，这种文化主导了该地区几千年的历史。
Perhaps even earlier, there had emerged on the steppes of Inner Eurasia the distinctive types of pastoralism that were to dominate the region's history for several millennia.
事实上，塔斯马尼亚岛上也能看到一些有几何图形镌刻的遗址，该岛大约一万年前从该洲大陆分离出来。
Indeed, sites with engravings of geometric shapes are also to be found on the island of Tasmania, which was separated from the mainland of the continent some 10,000 years ago.
海峡上唯一连接伯兰和大陆的桥梁拥堵不堪，卡车通常要在路上堵上几个小时。
The only bridge over the channel separating Burland from the mainland is congested, and trucks typically spend hours in traffic.
在哥伦布发现美洲大陆之前，大洋洲无可争议地存在着一种在新大陆被驯化的红薯，它有时被用来支持Heyerdahl的“太平洋上的美洲印第安人”理论。
The undisputed pre-Columbian presence in Oceania of the sweet potato, which is a New World domesticate, has sometimes been used to support Heyerdahl's "American Indians in the Pacific" theories.
当冰河时代开始时，大陆上的冰原逐渐增大，从海洋中蒸发出来的水逐渐减少，而这些水最终又会回到陆地上。
When an ice age begins, the continental ice sheets grow, steadily reducing the amount of water evaporated from the ocean that will eventually return to it.
八十七年之前，我们的祖先在这大陆上建立了一个国家。
Four score and seven years ago our fathers brought forth on this continent a new nation.
在大陆会议上，亚当斯被描绘为独立的主要倡导者。
At the continental congresses, Adams is depicted as the lead advocate for independence.
除南极以外，我居住在世界上所有的大陆上。
I live on all the continents in the world except Antarctica.
他是不是在欧洲大陆上完成他的教育，变成一个绅士回来了？
Did he finish his education on the Continent, and come back a gentleman?
但是，至少在默认情况下，非盟仍是这块大陆上最有效的多边组织。
But the au, at least by default, is also the continent's most effective multilateral institution.
代码可能转移到不同的大陆上。
伊瓜苏瀑布是美洲大陆上最宽的瀑布。
伊瓜苏瀑布是美洲大陆上最宽的瀑布。
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