Most reptiles reproduce by laying eggs on land.
大多数爬行动物通过在陆地产卵进行繁殖。
Without ice, they have to stay on land.
没有了冰，它们只能待在陆地上。
腕龙曾住在陆地上。
At 430 meters below sea level, the Dead Sea is Earth's lowest point on land.
死海位于海平面以下430米，是地球陆地上的最低点。
Have you ever heard of the trees that are homes over animals both on land and sea?
你有没有听过有一种树木，它们是陆地动物和海洋生物的家园？
Some hypotheses fail to account for simultaneous extinctions on land and in the seas.
有些假说不能解释同时发生在陆地和海洋的灭绝。
Later ancestors lived on land and stayed there for a very large number of generations.
后来的祖先生活在陆地上，并在那里居住了一代又一代。
There was no overlap, except when they added some species that spend time both in water and on land.
除了他们增加了一些既生活在水中又生活在陆地上的物种外，物种之间没有重叠。
Such feedbacks might involve ice on land and sea, clouds, or water vapor, which also absorb radiant heat.
这种反馈可能涉及陆地和海洋上的冰、云或水蒸气，这些也会吸收辐射热。
I grow hardly a half acre of corn in narrow strips, with clover between the strips, on land that is almost level.
我艰难地在狭长地带上种了半英亩的玉米，在这之间一块几乎平坦的地上种了三叶草。
On land, where it probably bred and gave birth, Ambulocetus may have moved around very much like a modern sea lion.
它们很可能在陆地上进行生育繁殖，而且，走鲸在陆地上移动时非常像现代海狮。
You might wonder how we can tell whether fossil animals lived on land or in water, especially if only fragments are found.
你可能想知道我们如何分辨化石上的动物是生活在陆地上还是水里，特别是如果只发现了化石碎片。
The revolution involved intensive commercial farming and the growing of animal fodder on land not previously used for crops.
这场变革涉及到集约化的商业化农业，以及在以前不用于种植作物的土地上种植动物饲料。
Glaciers are slowly moving masses of ice that have accumulated on land in areas where more snowfalls during a year than melts.
冰川正在缓慢地移动大量的冰，这些冰是在每年降雪量大于融化量的地区，在陆地上累积起来的。
Fossilized remains of Acanthostega, a primitive fish, reveal that even though the animal had rudimentary limbs, it could not walk on land.
棘螈是一种原始鱼类，它的化石遗迹显示，尽管棘螈有基本的四肢，但它却不能在陆地上行走。
On land, the supportive buoyancy of water is missing, the plant is no longer bathed in a nutrient solution, and air tends to dry things out.
在陆地上，水的浮力支持消失了，植物不再浸泡在营养液中，空气会使植物变干。
These troops have rarely been at the center of the action: in Afghanistan, they stay in the relatively calm north; in Lebanon, they patrol at sea, not on land.
这些部队鲜少处于行动的中心：在阿富汗，他们留驻于相对平静的北方；在黎巴嫩，他们则在海上巡逻，而不是在陆地上。
It's true that as people in developing nations move from the countryside to the city, the shift may reduce the pressure on land, which could, in turn, be good for the environment.
的确，随着发展中国家的人们从农村搬到城市，这种转移可能会减少对土地的压力，这反过来可能有利于环境。
Members of all parties endorsed a ban on land mines.
各党派成员都赞同禁用地雷。
They are bigger than any other animals on land.
它们比陆地上任何其他动物都大。
There is no enough food on land to support so many bears.
陆地上没有足够的食物养活这么多熊。
Have you ever heard of the trees that are homes to animals both on land and sea?
你有没有听说过有一类树木是陆地动物和海洋动物的栖息地？
I mean, Ambulocetus is a mammal that shows a sort of bridge between walking on land and swimming.
我的意思是，陆行鲸是一种哺乳动物，可以指明一个路上行走动物和水中游泳动物的清晰联系。
When they do forage for food and for shelter materials, they have to leave their homes and go up on land where their main predators are.
当它们寻找食物和遮蔽物的时候，它们不得不离开家，到主要捕食者所在的陆地上去。
Some of them utilized stone structures called stone canoes, and these canoes were on land, of course, and you can still see them on some islands today.
他们中一些人利用了一种叫石质独木舟的石头结构，当然，这些独木舟是陆地上的，现在仍然可以在一些岛屿上看到它们。
More than one-quarter of the world's oil and almost one-fifth of the world's natural gas come from offshore, even though offshore drilling is six to seven times more expensive than drilling on land.
全球超过四分之一的石油和近五分之一的天然气来自近海，尽管近海钻探的成本是陆地钻探的六到七倍。
It has to contend with pirates at sea and armed groups on land.
它们需要在海上与海盗们抗争，而在陆地上又要与武装组织战斗。
The closed-tube design allows saline aerials to be deployed on land, too.
这种联通管设计令盐水天线也可在陆地上部署。
Back on land, farmers are also suffering from the devastating drought.
回到陆地上，农民正遭受到毁灭性的旱灾。
Back on land, farmers are also suffering from the devastating drought.
回到陆地上，农民正遭受到毁灭性的旱灾。
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