The Scottish Highlands were once the site of extensive forests, but these forests have mostly disappeared and been replaced by peat bogs.
苏格兰高地曾经是大片森林的所在地，但这些森林大部分已经消失，取而代之的是泥炭沼泽。
Another thing would be, if a hatchling gets separated from the rest of its family, once the others get far enough away, its survival instinct kicks in.
另一件事是，如果幼崽和家族其他成员分开，一旦其他成员离得足够远，幼崽的生存本能就开始发挥作用。
But once the novelty wears off, the congestion should ease.
但一旦新鲜感慢慢褪去，人满为患的状况将得到减轻。
Exile, once the choice of many a deposed tyrant, no longer seems so safe.
流亡——一度是许多遭废黜的暴君的选择——看来不再是那么安全。
IMPORTS were once the lifeblood of Venice; even its patron saint came from abroad.
进口一度是威尼斯的活力源泉；就连它的守护神也是来自海外。
You can pick only one: once the choice is made, the other option is no longer available.
你只能选择一个，一旦决定了，另外一个就不再可用。
He told her once the campaign was over, he'd take her to New York for dinner and a Broadway show.
他跟她说竞选结束之后，他会带她去纽约吃顿饭看一场百老汇演出。
But it's a common pitfall to think that the job is done once the application is written and running.
我们通常认为应用程序编写完成并可以运行就算大功告成，但这是一个常见的误区。
Refinements are an interesting feature we hope to support once the specification is "refined" a bit more.
Refinements是一个很有意思的特性，我们希望规范再“细化”一点后就支持它。
World Bank President Robert Zoellick says this crisis will not be over once the emergency needs are addressed.
世界银行行长佐利克说，即使目前的紧急需求得到满足，这场危机的深远影响也难以消失。
The machines for sequencing, once the size of a mainframe computer, are becoming smaller and cheaper every year.
进行基因排序的机器以前的尺寸有电脑主机那般大小，而现在则逐年变小，价钱也逐年降低。
I am delighted to begin my journey in Xian, once the capital of China, still the heartland of the Chinese people.
我很高兴从过去曾是中国的古都，如今仍是中国中心区域的西安开始我的行程。
These guidelines win him the favor of the gods, allowing him to rule Mesopotamia once the flood waters recede.
这些准则令他赢得了神的青睐，让他在洪水退去后统治美索不达米亚。
Studies show that once the basic needs of shelter and food are met, additional wealth adds very little to happiness.
研究表明，一旦衣食住行的基本需求得到满足，额外的财富并不能增添多少幸福。
The Namibian mist rapidly dissipates once the sun rises, so the beetle has just a brief opportunity to collect water.
太阳一升，纳米比亚的雾气迅速消散，因此甲虫仅有一点儿时间集水。
Many people seem to assume that once the recession has finished, property prices can resume their traditional upward course.
许多人似乎默认一旦衰退结束，房产价格便会重回传统上升通道。
But once the scaffolding was removed the letters collapsed alarmingly. They still do, unless they have a line to aim for.
但是一旦把“脚手架”撤走，字母便稀里哗啦地倒下，歪歪扭扭的，除非有一条线给它们作参考。
And once the fibres can be made small enough to be woven into clothing, they could also function as a wearable microphone.
当这种纤维有朝一日能进一步“细化”可以被织进衣服时，它们就成了可以穿的麦克风啦！
Legend-and bits and pieces of historical fact-indicates that Tenochtitlan was once the world's biggest and most beautiful city.
各种传说和历史资料都表明特诺奇蒂特兰曾是世界上最大、最美丽的城市。
That is because gold was once the linchpin of the global monetary system and is still seen by many as a hedge against inflation.
这是因为黄金曾是全球货币体系中的基石，而且至今仍被很多人看作是抵御通胀的保值工具。
It all looks like so much junk, but there is something touching about it. Each item was once the moment's work of a human being.
虽然很多商品看上去就如同垃圾一般，但这其中却存在着一些能触动人心的东西，因为它们都凝聚了某位工人的辛勤劳动。
It all looks like so much junk, but there is something touching about it. Each item was once the moment's work of a human being.
虽然很多商品看上去就如同垃圾一般，但这其中却存在着一些能触动人心的东西，因为它们都凝聚了某位工人的辛勤劳动。
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