如果存在已经声明的任务，则返回该任务。
If a task exists that is already claimed, that task is returned.
抛上天空的灰云的大量存在已经够糟糕了。
The very existence of the ash cloud thrown into the sky was bad enough.
在你为了帮助做些事情之前，你的存在已经能够减轻一些压力。
Before you do something to help, your presence already can bring some relief.
它的大红斑是一个巨大旋转的风暴，存在已经至少3个世纪了。
The Great Red Spot, one such giant spinning storm, has existed for at least three centuries.
美国在海湾地区的军事存在已经并将持续引起普遍的愤恨。
S. military presence in the Gulf has been, and continues to be, a source of popular resentment.
虚拟化并不是什么新主题；实际上，它的存在已经超过40 年了。
Virtualization is not a new topic; in fact, it's over four decades old.
事实上学院的存在已经超过八百年了，在这几百年里各种哲人层出不穷。
The academy actually persisted for 8 hundred years, and there were quite different philosophers throughout that period.
对于Web服务的任何调用尝试都不会成功，这是由于根据请求环境不存在已经定义的策略。
Any attempted invocations of this web service won't be successful since there is no defined policy on how it is to be used according to the requested situation.
允许救援人员通过卫星与外界取得联系的技术已经存在。
The technology to allow relief workers to contact the outside world via satellite already exists.
过去30年里许多值得珍惜的价值观已经不复存在。
In the last 30 years many cherished values have bitten the dust.
和以前一样，为此流程输入任意名称，并提供系统中已经存在的唯一个人身份证号码。
As before, enter any name for this process along with a unique person ID that already exists in the system.
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.
我轻轻地拉了拉他的袖子，但他已经忘记了我的存在。
I pulled gently at his sleeve, but he had forgotten my existence.
在当今世界上存在的所有语言中，肯定有已经发展多年的复杂性。
In all the languages existing in the world today, there are complexities that must have been developed for years.
我对海关例行公事的不耐烦暗示着，几小时前我还不知道存在的克洛艾，已经产生了渴望的状态。
My impatience with the customs ritual indicated that Chloe, who I had not known existed a few hours ago, had already acquired the status of a craving.
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".
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.
知道海水的盐度和大致的水量之后，他计算出了海水中已经存在的盐的量。
Knowing the salinity of ocean water and the approximate volume of water, he calculated the amount of salt already held in solution in the oceans.
他反复琢磨那些已经存在的、但尚未成熟的创意，例如鼠标驱动的电脑、数字音乐播放器、智能手机、平板电脑等，并向其他公司展示如何让这些构思变为现实。
He repeatedly took an existing but half-formed idea—the mouse-driven computer, the digital music player, the smartphone, the tablet computer—and showed the rest of the industry how to do it properly.
就像我之前说到的，铀铅年代测定法已经存在一段时间了。
Like I said before, Uranium-Lead Dating has been with us for a while.
这个舒适的工作环境已经不复存在了。
由于自然选择，大多数曾经存在过的物种已经灭绝，所以这不是一个新现象。
Thanks to natural selection, most species that have ever lived has already gone extinct, so this is not a new phenomenon.
这并不意味着我的待办事项清单已经不存在了，但我越来越意识到慢下来的重要性，并确保我在进行每天的活动时，能享受这一过程。
It doesn't mean that my to-do lists no longer exist, but I've become more aware of the importance of slowing down and making sure that I enjoy the daily activities as I carry them out.
这方面已经取得了一些成功，但仍存在一些争议。
There has been some success with this, but it's still somewhat controversial.
问题是，虽然其他事情已经改变，这些限制却依旧存在。
The trouble is that these restrictions have remained while other things have changed.
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.
但是现在，已经发现在地球上存在完全黑暗的地方，比如海洋下面几英里的洞穴里。
But now, places have been found on earth that are in total blackness, such as caves several miles beneath the ocean.
由于少数族裔企业的潜在市场已经通过赞助公司而存在，因此少数族裔企业面临的地理位置和市场波动风险要小得多。
Since potential markets for the minority businesses already exist through the sponsoring companies, the minority businesses face considerably less risk in terms of location and market fluctuation.
显然，过度捕捞已经使这里的鳕鱼不复存在了。而曾经很强大的纽芬兰船队现在在海底疯狂地搜寻螃蟹。
It had, apparently, been fished out of existence; and the once mighty Newfoundland fleet now gropes about frantically for crab on the seafloor.
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