This sediment layer is enriched in the rare metal iridium and other elements that are relatively abundant in a meteorite but very rare in the crust of Earth.
这一沉积层富含稀有金属铱，以及其他在陨石中较丰富而在地壳中十分罕见的元素。
Rare earth mines often also contain radioactive elements, such as uranium and thorium.
稀土矿山常常也含有放射性元素，比如铀和钍。
Rare earth elements from 4 square kilometers of such areas could meet Japan's annual demand of about 30, 000 tons.
上述区域内每4平方公里范围的稀土元素储量，即可满足日本每年约30000吨的需求。
Existing lasers use media ranging from crystals doped with rare-earth elements to specific mixtures of gas and even certain sorts of semiconductors.
现有的激光器使用的介质有，掺杂有稀土元素的晶体、特定比例的气体，甚至是某些特定半导体。
It is the first time attainable rare earth elements were confirmed on the seafloor.
这是海底可利用的稀土元素资源量首次得到确认。
Today we continue our report on the group of chemical elements known as rare earth metals.
今天我们将继续报道稀土金属类的稀有化学元素。
Although you can define indexes on non-leaf elements, they are useful only in rare cases.
尽管可以在非末端元素上定义索引，但是仅在少数情况下这些索引才有用。
The discovery of lunar water has raised questions as to whether other resources such as helium 2 and rare Earth elements could be found on the moon as well.
月球水的发现带来了更多疑问，是否还有例如氦2和地球上的稀土元素的资源在月球上被找到。
Despite their collective name, the 17 elements are not rare.
稀土是17种元素的总称，其实稀土并不稀少。
A rare reminder of California's rich Spanish and Mexican history, the structure now sits abandoned, deteriorated, exposed to the elements and threatened by demolition.
这座房屋是加利福利亚洲富有阶层的西班牙和墨西哥人稀有的历史遗存，现在已被遗弃，遭受风吹雨淋，面临毁坏的危险。
The nearside also has much more kreep-potassium, rare-earth elements, and phosphorus-according to scientists.
据科学家称，月球近地端含有更多的克里普矿物，稀有地球元素钾，还有磷。
Paradoxically, mining rare earth elements - crucial for a number of green technologies - is potentially damaging for the environment.
矛盾的是，开采稀土元素会对环境造成潜在危害，但这些元素对许多绿色技术来说又是至关重要的。
"The" rare earth elements "are a group of 17 naturally occurring metallic elements used in small amounts in everything from high-powered magnets to batteries and electronic circuits."
“稀土”是一种自然产生的17组金属元素，从大马力磁铁电池到电子电路都会使用。
The substances in question include a bunch of rare-earth metals and a few other elements which—used a pinch here, a pinch there—enhance the way many industrial materials function.
讨论的对象包括了一堆稀土金属以及用于提高工业材料功能的少量元素。
lunar water has raised questions as to whether other resources such as helium 2 and rare Earth elements could be found on the moon as well.
月球水的发现带来了更多疑问，是否还有例如氦2和地球上的稀土元素的资源在月球上被找到。
Kato and the other researchers assumed those particles had absorbed rare earth elements and accumulated on the seafloor.
Kato和另一位研究者相信这些颗粒吸附了稀土元素，并使其在海底沉积。
This is a rare case of Groovy violating the Rule of Least Surprise, but because getting elements out of a map is far more common than using reflection, it is an exception that I can live with.
这是Groovy比较罕见的打破 “最少意外原则” 的情况，但是由于从map获取元素要比使用反射更加常见，因此我可以接受这一例外。
The quantity of rare earth elements buried in the Pacific Ocean is estimated to be 90 billion tons, or 800 times larger than the 110 million tons buried on land.
太平洋底蕴藏的稀土元素资源量估计达900亿吨，比其1.1亿吨的陆地蕴藏量多800多倍。
China recently eased its export quotas, boosting the allowance for the first half of the year to 16,300 tonnes of rare earth elements, up by more than 8 per cent compared with the same period in 2009.
中国近期放宽了稀土出口配额，允许今年上半年出口1.63万吨稀土，比2009年同期增加逾8%。
It is not as though the rare-earth elements-scandium, yttrium and lanthanum plus the 14 so-called lanthanides-are all that rare.
并非所有稀土元素都像钪、钇、镧加上14所谓的镧系元素那样稀少。
Unlike the Bre-X scam, the company's Wyoming land does indeed have rare earths, but they are in small concentrations and are mostly the less-desirable sub-group of the elements.
不像Bre-X诈骗案，REE在怀俄明的地里确实有稀土，但却是很分散和冷门的子群元素。
The effect of rare earth elements on the microstructure and properties of steel P20 has been investigated.
研究了P 20钢中加入微量稀土元素后性能和组织的变化规律。
Skiff, a start-up spun out of Hearst, is a rare exception to this rule. Its 11.5-inch reader is large enough to show off all elements of a magazine’s design and accommodates advertising too.
Hearst出版公司新的创业公司Skiff是个例外，它的11.5英寸屏足够展示杂志设计的所有细节并且可以安放广告。
Rare earth, an nonrenewable resource, is a general name for 17 low-reserve metallic elements.
稀土是储量较少的一类金属的统称。
Rare earth, an nonrenewable resource, is a general name for 17 low-reserve metallic elements.
稀土是储量较少的一类金属的统称。
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