Some birds which were once a common sight are now becoming rare.
有些曾经随处可见的鸟类现在日益稀少。
They were once the butt of jokes.
他们曾经是人们的笑柄。
The reptiles were once on top of the world.
爬行动物曾经位居食物链顶端。
An elephant and a crocodile were once standing beside the river.
一只大象和一只鳄鱼曾经站在河边。
On the night we speak of, all the children were once more in bed.
我们提到的那天晚上，孩子们又都上床睡觉了。
There were once upon a time three sisters, quite transparent, and very beautiful.
从前有三姐妹，非常透明，非常美丽。
Just curious, whatever happened to the minute steak sandwiches that were once offered.
很好奇，曾经提供的快熟牛排三明治发生了什么。
Cameras were once big and bulky.
摄像器材曾经很庞大笨重。
我们一度是好朋友。
Boundaries that were once stark are now fuzzy.
曾经十足刻板的界限如今变得模糊不清。
Failed states were once poor almost by definition.
失败的国家根据以往的定义就是穷国。
Rocks from the moon show that they were once melted.
来自月球的岩石表明它们曾经被融化。
There are now deserts where there were once thick forests.
在那些曾经是茂密森林的地方，现在出现了沙漠。
Honey bees that were once very common are now becoming very rare.
蜜蜂过去很常见，但是现在却少见了。
Losing interest in activities that were once a source of pleasure.
罪曾经喜爱的活动失去兴趣。
But for that single day, they were once again the true owners of the earth.
但那一天，它们又一次是地球的真正主人了。
Fishing and shipbuilding were once very important in Britain 's history.
钓鱼和造船曾经在英国的历史中十分重要。
Cameras were once big and bulky.Today, really good cameras fit in your pocket.
以前的照相机都又大又笨，而如今，一些好的照相机小到可以装进口袋里。
Major banks, which were once the most volatile stocks, have become a snooze.
一些曾经波动较大的主要银行股价变得“睡意阑珊”了。
What were once the most straightforward activities become a constant ordeal.
曾经最简单不过的活动，现在成了一个又一个的考验。
Our fast-paced, reflexive shifts in focus were once crucial to our survival.
我们下意识里快速地变换注意力的焦点，这对人的生存来说曾经非常重要。
Similar things were once said of much of the rest of asia-and sometimes still are.
类似的事情也曾在亚洲的其它地方出现过——并且有时仍是这样。
But jobs, which were once a fairly reliable guide to class, have become misleading.
然而，工作，这个曾经是判断某人所属阶级的一个十分可靠的因素，如今却成了一个误导的因素。
On the appointed day, the study volunteers were once again brought into the NIMH lab.
在那天，志愿者被再次带到实验室。
There were once eight tiger subspecies, but three became extinct during the 20th century.
老虎曾经有过一共8个亚种，但其中三个亚种在20世纪灭绝。
Tourists, meanwhile, are about to gain entry into areas that were once strictly off limits.
同时，游客也将有机会进入那些曾被严格限制进出的区域。
Tourists, meanwhile, are about to gain entry into areas that were once strictly off limits.
同时，游客也将有机会进入那些曾被严格限制进出的区域。
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