世界各大洲生活水平都在下降,所以悲观主义有充分的依据.
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There is little we can do to stop this natural disintegration of the continents.
我们难以阻止这种陆地的自然蜕变作用.
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There is a higher heat production in the upper mantle below oceans than below continents.
大洋下的上地幔要比大陆下的上地幔有较高的热产率.
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They would have lived on two continents and sampled two different ways of life.
他们要住在两个截然不同的大陆上,过截然不同的生活.
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The idea that continents broke and drift apart is known as the hypothesis of continental drift.
认为大陆曾经分裂并漂离的想法叫大陆漂移假说.
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There is an ever-increasing need to link communications systems on various continents.
日益增长的需要把各大陆的通讯系统连接起来.
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The difference accounts for the existence of continents and ocean basins.
这种差别解释了大陆和海洋盆地存在的原因.
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20世纪50年代古地磁技术的突破为确定大陆的古地理位置、古陆块之间的相互关系以及大陆裂解和大洋扩张的历史提供了更有说服力的证据。
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是中立的政策,拒绝介入外部冲突,对其他各大洲不抱领土扩张的野心,同时禁止他国干涉我们的事务。
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Millions of years ago all the southern continents formed a single landmass known as gondwanaland.
数百万年前,南半球各洲组成了一个大陆,称为冈瓦纳大陆。
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