袁隆平发明了超级杂交水稻，这项技术可在不扩大稻田面积的情况下增加水稻产量。
Yuan Longping invents super hybrid rice, making it possible to increase rice harvest without expanding the area of the field.
他们发现，20世纪80年代之前的产量增长速度在20世纪90年代和21世纪有所放缓，这占据了作物收割面积的24%至39%。
They find that on between 24% and 39% of all harvested areas, the improvement in yields that took place before the 1980s slowed down in the 1990s and 2000s.
在美国种植有大面积的大豆。
Enormous acreages of soy beans are grown in the United States.
专家们认为即将到来的干旱将会是大面积的。
检测显示一楼下面的横梁已经有大面积的腐烂。
Investigations had revealed extensive rot in the beams under the ground floor.
袁博士寻找一种方法，在同样面积的土地上收获更多的水稻。
Dr. Yuan searched for a way to get more rice with the same size of the fields.
作为世界第三长河，它覆盖了中国陆地面积的五分之一。
As the world's third-longest river, it covers one-fifth of China's land area.
它的面积约180万平方公里，约占全国总面积的五分之一。
It covers an area of about 1.8 million square kilometers, about one fifth of the national total.
中国的湿地保护非常重要，中国的湿地面积达6590万公顷，占世界湿地面积的10%，湿地面积居世界第四。
Protection of wetlands in China is very important, as China has wetlands with 65.9 million hectares, 10 percent of the world's wetland areas, which comes fourth in the world.
众所周知，大面积的森林砍伐会导致洪水泛滥。
It is widely acknowledged that extensive deforestation would lead to flooding.
它可以在环境中存留多年，并污染大面积的土地和水。
It can remain in the environment for many years and pollute large areas of land and water.
当然，有些动物物种需要大面积的栖息地，有些则需要长途迁徙。
There are, of course, animal species that require large areas of habitat, and some migrate over very long distances.
暴雨和泛滥的河流在美国中西部和东部地区造成了大面积的洪水。
Heavy rains and overflowing rivers have caused extensive flooding in some parts of the US midwest and in eastern regions of the US as well.
西方森林面积的快速增长似乎同其他各地的森林开采速度一样不可阻挡。
The growth of Western forests seems almost as unstoppable as deforestation elsewhere.
使用太阳能电池板来产生足够的电力所需的面积大约是照明面积的20倍。
Generating enough electricity by using solar panels requires an area about 20 times larger than the area being illuminated.
这只是受益总面积的一小部分，共约50万英亩，所以优先考虑火灾或干旱风险最大的地区是至关重要的。
That's only a small share of the total acreage that could benefit, about half a million acres in all, so it will be vital to prioritize areas at greatest risk of fire or drought.
垃圾填埋场面积的缩小，以及填埋和焚烧垃圾成本的上升，都在迫使地方政府更深入地研究如何回收利用垃圾。
Shrinking landfill space and rising costs for burying and burning rubbish are forcing local governments to look more closely at recycling.
气候变化及周期性的厄尔尼诺现象引起的海水变暖，已经造成了大面积的珊瑚礁在所谓的“漂白”事件中消失殆尽。
Warmer sea temperatures caused by climate change and periodic El Nio events have caused large areas of coral to be wiped out in so-called "bleaching" events.
在古罗马时期，意大利半岛上有大面积的冷杉林，是建造军舰的首选材料，但是，冷杉的稀缺性早在14世纪早期就出现了。
In ancient Roman times, the Italian peninsula had great forest of fir preferred for warships, but scarcity was apparent as early as the early fourteenth century.
利用GIS方法建立了数字高程模型（DEM），研究了子汇水面积的边界。
By means of GIS method, the digital elevation model(DEM)is established, the subcatchment boundaries are studied.
14世纪做过大面积的翻修。
这个区域的面积是所有小区域面积的总和。
The area of this region is the sum of the areas of all the little pieces.
慷慨的退休金导致了大面积的提前退休现象。
Generous pensions have produced an epidemic of early retirement.
不过大面积的干涸土地在未来将有着新的用途——发电。
But large swaths of those dry fields could have a valuable new use in their future - making electricity.
我们不止一次走在大面积的薄冰上，这让我们非常紧张。
On more than one occasion we came across enormous areas of very thin ice, which is quite stressful to travel on.
实际上这对任何闭曲线都适用，向外的通量还是面积的两倍。
It is true actually for any closed curve that the flux out of it is going to be twice the area of the region inside.
那么他们会捐多少提示：在最大面积的公园情况下，哪户居民愿意捐献？
How much do they contribute? Hint: which individual I is willing to contribute at the largest park size?
那么他们会捐多少提示：在最大面积的公园情况下，哪户居民愿意捐献？
How much do they contribute? Hint: which individual I is willing to contribute at the largest park size?
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