It's just a scarce unit of exchange.

实只种比较稀有的交易单位。

The unusual cross became popular among breeders at the end of the 1990s.

在20世纪90年代末，种稀有的品种在育种者中流行开来。

Maybe you carry the most powerful passport in the world, or perhaps the rarest passport.

也许你的护照世界上最有影响力的，也可能最稀有的。

There are breeding programs that keep this rare parrot species around for people to see.

人们启动了养殖项目，让人们仍可以看到种稀有的鹦鹉。

Maybe it's a rare collector's edition or something.

或许稀有的收藏版本。

It's one of New Zealand's rarest mainland penguin species.

新西兰最稀有的内陆企鹅物种之。

Like other disappearing species of frogs, he's one of rarest animals in the world.

和正在消失的青蛙物种样，基多火箭蛙也世界上最稀有的物种之。

Tribute payers were also obliged to produce certain quantities of rare and precious goods.

进贡者也被要求生产定数量的稀有和珍贵的物品。

The sails were made of silk, a rare and costly cloth from China.

船帆由丝绸制成的，种来自中国的稀有且昂贵的布。

These days, almost nobody catches a rare giant sturgeon.

些日子，几乎没有人捕到稀有巨大的鲟鱼。

Given the right help even the rarest creatures can return from the brink.

只要得到适当的帮助，即使最稀有的生物也能从濒临灭绝的边缘回生。

We are pulled towards rare and hard-to-follow ideas.

我们被稀有的、难以理解的想法所吸引。

It is a perfect place for some rare birds.

些稀有鸟类的完美居住地。

Visitors are drawn to the park because of its rare and unique bird species.

许多游客由于稀有而独特的鸟类物种而被吸引到公园。

And rare wild animals have been pushed to the edge of disappearing.

稀有的野生动物被推向濒临灭绝的边缘。

Many of the rare plant species that grow here are found nowhere else on Earth.

许多生长在里的稀有植物物种地球上他地方找不到的。

They try to grow cacti or rare tropical flowers in their kitchens and sitting rooms.

他们在厨房和客厅里种上仙人掌或者稀有的热带花草。

It's also home to many different animal species including rare geckos and the snow leopard.

也许多种野生物种的家园，包括稀有的蜥蜴和雪豹。

It's possible some of the more exotic isotopes of oxygen came from the other planet.

有可能些稀有的同位素部分来自另星球。

If you're looking for something really rare, I suggest you check out Astatine.

如果你在寻找稀有的东西的话，建议你看下砹。