Modern communication system is a land-sea-space three-dimensional communication network whose realization is mainly restrained by underwater communication.
现代通信系统是陆-海-空三维通信网，三维通信网的组成主要制约于水下通信。
U.S. forces are poised for a massive air, land, and sea assault.
美军做好了随时从空中、陆地和海上发动大规模攻击的准备。
After ten days at sea, we had our first sight of land.
我们在海上航行十天之后，首次看见陆地。
It isn't clear whether the plane went down over land or sea.
不清楚飞机是落在陆地上还是海里。
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。
The legs were certainly functional both on land and at sea.
无论陆地还是海洋，这些腿都能发挥作用。
It was undoubtedly a whale that linked life on land with life at sea.
毫无疑问，这是一种联系着陆地生命和海洋生命的鲸鱼。
Not only are we bring about the extinction of life on a vast scale, we are also making the land, the air and the sea so toxic that the very conditions of life are being destroyed.
我们不仅使生物大规模灭绝，还令陆地、空气和海洋含有巨大毒性，从而使生物的生存条件遭到破坏。
Not only are we bringing about the extinction of life on a vast scale, we are also making the land and the air and the sea so toxic that the very conditions of life are being destroyed.
我们不仅使生物大规模灭绝，还令陆地、空气和海洋含有巨大毒性，从而使生物的生存条件遭到破坏。
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？
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。
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。
The land varies in height from 700 meters above sea level to over 2,000 meters and is home to a great diversity of rare plants and animals.
这片土地的高度从海拔700米到2000多米不等，是多种珍稀动植物的家园。
After twelve days at sea, they sighted land.
在海上航行十二天后他们看到了陆地。
The sea may rise or the land may fall; either way the sand dunes will be gone in a short time.
海平面可能会升高，或者陆地可能会下降；不论发生哪种情况，沙丘都将很快消失。
They fought both at sea and on land.
他们在海上和陆上都打过仗。
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'd rather love the land, like Thomas, or the sea…" Pa patted his hand.
“我宁愿像托马斯那样热爱土地，或者大海……”爸爸拍拍他的手。
Superb systems of communication by air, sea and land make it possible for us to visit each other's countries at a moderate cost.
有了一流的空中、海上和陆地交通系统，我们就能够以低廉的费用访问彼此的国家。
The Greeks were wedded to the sea; the Romans, to the land.
希腊人热爱海洋；罗马人热爱陆地。
It was undoubtedly a whale that linked life on land with life at sea.
毫无疑问，是鲸这种动物把陆地上和海洋中的生命联系起来。
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。
Even today, microscopic meteorites continually bombard Earth, falling on both land and sea.
即使是现在，微小的陨石仍在不断地撞击地球，然后落到陆地上和大海中。
Whatever the reason for mountain formation, as soon as land rises above sea level it is subjected to destructive forces.
不管形成山脉的原因是什么，一旦陆地上升到海平面以上，它就会受到毁灭性的力量的影响。
As in the sea, it seems that on the land one key food chain collapsed: the one with leaves as its basic raw material.
和在海洋中一样，陆地上一个关键食物链，一个以树叶为基本原料的食物链似乎也崩坏了。
Sure enough, these amphibious species show up on the triangular graph approximately half way between the "wet cluster" of sea turtles and the "dry cluster" of land tortoises.
可以肯定的是，这些水陆两栖物种的数据出现在接近三角坐标中间的位置，位于水栖海龟和陆栖乌龟的坐标点之间。
Then, on 6 March, they approached the coastline of Antarctica's Ross Sea, looking for a place to land.
然后，在3月6日，他们靠近了南极洲罗斯海的海岸线，找一个可以上岸的地方。
Some traders traveled over land and others sailed across the sea.
一些商人选择陆路，而另一些则选择横渡大海。
Some traders traveled over land and others sailed across the sea.
一些商人选择陆路，而另一些则选择横渡大海。
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