The reason for this is easy to recognise: in nature, the existent organisms either adapt or are regularly replaced by new types.
原因很容易理解：在自然界中，现存的生物要么适应环境，要么被新物种取代。
Hospital beds were scarce and medicines were practically non-existent.
当时医院病床紧缺，药物根本所剩无几。
Though no fault of their own, they can suddenly find their productivity deteriorating or quality control non-existent.
虽然不是他们自己的错，但他们会突然发现自己的生产率下降或质量管理失控。
"The evidence for kitelifting is non-existent," says Willeke Wendrich, an associate professor of Egyptology at the University of California, Los Angeles.
加州大学洛杉矶分校埃及学副教授韦利克·文德里希说：“没有证据证实（古埃及人利用）风筝抬起重物。”
The Chinese doctor took my pulse and asked to see my tongue, both of which were new experiences to me because they are both non-existent in Western medicine.
中医给我把脉并要求看我的舌头，这对我来说都是全新的经历，因为在西医中，这些都是不会有的。
Another challenge for more than a million of the most qualified farm workers and managers is a non-existent path to citizenship — the greatest barrier to building a farm of their own.
对于100多万合格的农场工人和管理人员而言，另一个挑战是他们没有办法拥有市民身份——这是他们建立自己农场的最大障碍。
Absolute non-killing is non-possible and non-existent.
绝对的不杀生是不可能也是不存在的。
You are trying to persuade me that the non-existent exists.
你想说服我不存在是存在的。
Traceability among information elements is either limited or non-existent.
信息要素之间的可追溯性是受限的，或不存在的。
Much x86 hardware has poor, limited, or non-existent support for ECC memory.
许多x86硬件只对ECC内存提供可怜的、有限的支持，甚至不提供支持。
SUMA will filter and download only fixes that are not existent in the lpp_source.
SUMA将筛选并仅下载那些lpp _ source中不存在的修复程序。
They're working off of an imagined use case, with an invisible and non-existent user.
他们开发出的是想象的用例，以及看不到和不存在的用户。
However, you can access potentially non-existent entries safely, using the get function.
不过，您可以使用get函数，安全地访问一个可能不存在的条目。
Current pension systems are all too often unsustainable, partial, fragmented or non-existent.
当前的养老金体制通常不具有可持续性、片面、支离破碎或根本不存在。
In areas where health systems are weak or virtually non-existent, basic data will not be collected.
在卫生系统薄弱或事实上不存在的地区，是不会收集基本数据的。
When times are good, volumes are usually high; but when times are bad, they can be non-existent.
在光景好的时候，交易量总是保持高位；但在光景不好时，甚至可能出现无交易量的情形。
Piracy is not that uncommon in societies where the national state is either weak or non-existent.
在民族国家不是弱小就是难以存活的社会中，海盗并不罕见。
Kepler-10b, however, has some curious parallels with the solar system's non-existent innermost planet.
然而对Kepler - 10b的好奇与当年搜索太阳系内不存在的近核心行星颇有相似之处。
And they need to overcome the obstacle that most slum-dwellers have weak or non-existent property rights.
并且思考者还需要克服障碍：绝大部分居于陋屋的人都少有或者没有产权。
To build market share, it charges tiny or non-existent fees, so by any normal measure it wouldn't be worth much.
出于构筑市场份额，它只收取了微薄或者说几乎不存在的费用，因而任何常规手段都不足于对其作出正确衡量。
Another problem is that people can leave money to non-existent charities; "cancer relief" being a common example.
另外一个问题是，立遗嘱的人可能会将遗产馈赠给不存在的慈善机构；“抗癌机构”就是一个经常碰到的例子。
It has always been more about creating demand for real estate in places where water was scarce or non-existent.
而是为那些水资源匮乏或根本没水地区的房地产创造了需求。
Ryanair is still committed to cheap fares and secondary airports where landing charges are low or non-existent.
Ryanai仍旧致力于提供低票价以及让飞机停在降落费较低或不收取降落费的次级机场。
External forces like the hostile FDA or non-existent IPO markets are conspiring against certain VC-backed companies.
严苛的美国食品药品管理局(FDA)和消失的IPO市场等外部力量让某些依赖风投支持的公司处于不利境地。
Use a credit card for online purchases. Most credit card companies will help you with non-existent or damaged products.
使用信用卡来在线支付，大多数信用卡公司将帮助您排除不存在的或者损坏的产品。
His business is stagnant, he has the roommate from hell, and since his divorce, his love life is completely non-existent.
他的生意状况很不好，同屋的室友令人无法忍受，自从他离婚后爱情生活又是一片空白。
This means that privileges can be granted to non-existent user and group accounts with the information being stored in the database.
这意味着，可以把权限和数据库中存储的信息授予不存在的用户和组帐户。
This means that privileges can be granted to non-existent user and group accounts with the information being stored in the database.
这意味着，可以把权限和数据库中存储的信息授予不存在的用户和组帐户。
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