这使人们确信天文周期已经存在了数十亿年。
It assures that the astronomical cycles have been in existence for billions of years.
例如，当美国在1848年获得新墨西哥的主权时，大草原就已经存在了。
For example, the Rio Grande pueblos already existed when the United States acquired sovereignty over New Mexico in 1848.
虽然我们不知道这其中有多少是真实的，但可以肯定的是，丝绸栽培在中国已经存在了几千年。
While it is unknown just how much of this is true, it is certainly known that silk cultivation has existed in China for several millennia.
根据最近的一项调查，尽管网上零售已经存在了大约20年，但近一半的网上零售商仍然没有收到满意的消费者反馈。
Although online retailing has existed for some twenty years, nearly half of the internet retailers still fail to receive satisfactory feedback from consumers, according to a recent survey.
它在那里已经存在了350多年。
电动汽车已经存在了超过一百年。
Electric vehicles have been around for more than a hundred years.
它已经存在了几百年了。
美国本土语言在欧洲殖民以前就已经存在了，现在美国已经丢失了超过三分之一的本土语言。剩下的192种语言被联合国教科文组织列为介于“不安全”和“灭绝”之间。
The US has already lost more than a third of the native languages that existed before European colonization, and the remaining 192 are classed by UNESCO as ranging between "unsafe" and "extinct".
SQL存储过程已经存在了，它们是可重用的资产。
The SQL stored procedures already exist and are available as reusable assets.
另一个参考认为鲎虫也许已经存在了3亿年。
Another reference states tadpole shrimp may have been living for 300 million years.
神经连接学实际上远在这个名词出现前就已经存在了。
伊伊马尼山的冰川估计已经存在了成千上万年了。
The glaciers on Illimani are estimated to have been there for thousands of years.
实际上，您可能犯的很多错误以前就已经存在了。
In truth, many of the mistakes that you're likely to make have been made before.
这种“动量效应”已经存在了100多年，并在许多国家都发生过。
This "momentum effect" has been in existence for over a century and has been observed across many countries (see article).
但是技术已经存在了，有人注意到，其他厂商也在生产MP3播放器。
But the technology already existed, someone else notes — other people were making MP3 players.
而且这种比轻量级的以文档为中心的格式更加轻巧的格式已经存在了。
And it turns out that such lighter-than lightweight document-centric formats exist.
您可能需要创建helloworld目录，但父目录可能已经存在了。
You will likely have to create the helloworld directory, but the parent directories will already be there.
这些趋势已经存在了好几十年，并在2000年之后愈演愈烈。
These trends have accelerated since 2000, but they have been in place for decades;
防弹背心已经存在了数十年，但是防弹皮肤还仅存于科幻小说中。
Bullet proof vests have been around for decades but skin that can stop them has only been the preserve of science fiction.
汽车厂商通过与社区一起工作来推出新的品牌，这种模式实际上已经存在了。
A car company could take an existing brand and work with the community that already exists around it.
汽车是由不同的零部件组成的，它们在车组装好之前就已经存在了。
Cars are made up of parts that existed before the car itself existed.
NIC硬件的虚拟化以各种形式已经存在了一段时间—在虚拟交换机出现之前。
The virtualization of NIC hardware has existed for some time in a variety of forms-well before the introduction of virtual switching.
但是，如你们从关键的安全问题里看到，它们已经存在了很长时间了。
But as you saw from a little litany of key safety issues, they've been around for a very long time.
事实上，在第一个欧洲人的足迹踏上这片大陆之前美洲就已经存在了。
In actuality, America was settled long before the first European set foot on the continent.
有些功能已经存在了一段时间了，但是现在才最终被合并进标准发行版。
Some features have been around for a while, but are finally being incorporated into the standard release.
这些习惯在我的生活中已经存在了很多年，我不能想象没有它们的生活。
These habits have been my lifeline for many years and I cannot imagine a balanced (and happy) life without them.
这个形式的计算机犯罪其实已经存在了，无论如何，用计算机实施一次抢劫很困难。
Computer crime like this in fact exists already. However, it is very difficult to carry out a successful robbery by computer.
这个形式的计算机犯罪其实已经存在了，无论如何，用计算机实施一次抢劫很困难。
Computer crime like this in fact exists already.However, it is very difficult to carry out a successful robbery by computer.
这个形式的计算机犯罪其实已经存在了，无论如何，用计算机实施一次抢劫很困难。
Computer crime like this in fact exists already.However, it is very difficult to carry out a successful robbery by computer.
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