这种训练没有效果，浪费了稀有资源。
This kind of training is ineffective, and wasteful of scarce resources.
他们在很多地方重新种上了稀有罕见的植物。
They have replanted many areas with rare and unusual plants.
它很稀有，但它并没有在消失。
它们一定是由稀有材料制成的。
它被藏了这么久，因为它太稀有了。
然而，新品种的蛇则要稀有得多。
他们这次不会只使用稀有的古董陶器。
他问我花了多少钱买这件稀有的珠宝。
稀有的树木被细心地从山坡上移植下来。
熊猫是最稀有的动物之一。
除草剂可能会破坏湖泊中某些稀有植物的种群。
The herbicide might damage populations of certain rare plant species that the lake contains.
一些居民担心这种大米会威胁到某些稀有候鸟的生存。
Some residents voiced concern that the rice could threaten certain species of rare migratory birds.
有钱人会相互竞争，花大量的钱为他们的花园买最稀有的花。
Wealthy people would compete, spending enormous amounts of money to buy the rarest flowers for their gardens.
如果你对硬币收集感兴趣，首先要做的就是找到一枚稀有的硬币。
If you are interested in coin collecting, the first thing to do is to find a rare coin.
在种子世界里，这使得它们很稀有，因为大多数开花植物的种子都很结实。
In the seed world, that makes them rare, because most seeds from flowering plants are quite robust.
动物园里有一些世界上最美丽和稀有的动物，为你提供了参观野生动物的好机会。
The Zoo has some of the most beautiful and rare creatures in the world and offers you a great chance to visit wild animals.
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。
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.
他们偶然发现一种稀有金属铱的含量在边界处突然变得很丰富，然后又慢慢地消失了。
They had found, accidentally, that a rare metal, iridium, suddenly became very abundant exactly at the boundary and then slowly fell away.
这是一种生长在澳大利亚的非常稀有的树——冬花，但它更广为人知的名字是夜冠橡树。
It's a species of a very rare tree that grows in Australia, Eidothea hardeniana, but it's better known as the Nightcap Oak.
发现鲸和海豚身上有后肢；这种稀有的现象是由于它们在陆地上的祖先身上的特征再次被遗传。
Whales and dolphins have been found with hind limbs; this rare occurrence is due to the reemergence of a trait they inherited from their terrestrial ancestors.
现在，外来食肉植物的黑市交易非常活跃，以至于植物学家一直对某些稀有物种的位置三缄其口。
The black market trade in exotic carnivorous plants is so vigorous now that botanists are keeping the location of some rare species a secret.
钻石是稀有火成岩（称为煌斑岩和金伯利岩）中偶尔出现的一种成分，其年代测定方法从未令人满意。
Diamonds, an occasional component of rare igneous rocks called lamproites and kimberlites, have never been dated satisfactorily.
她正在努力寻找一种方法，从那些适应极端干旱天气的稀有野生植物中获取特性，并将它们用于粮食作物。
She is hard at work finding a way to take traits from rare wild plants that adapt to extreme dry weather and use them in food crops.
当一种猎物变得稀有时，如果捕猎者能够转向其他更容易找到的物种，这种转变可以让原来的猎物数量得到恢复。
And if a predator can move on to another species that is easier to find when a prey species becomes rare, the switch allows the original prey to recover.
当一种猎物变得稀有时，如果捕猎者能够转向其他更容易找到的物种，这种转变可以让原来的猎物数量得到恢复。
And if a predator can move on to another species that is easier to find when a prey species becomes rare, the switch allows the original prey to recover.
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