水是一个是否有生命存在的关键问题，即使是以微生物的形式，火星上和地球上都曾经存在，所有已知的生命都需要水。
Water is a key to the question of whether life, even in the form of microbes, ever existed on Mars. On Earth, all known forms of life require water.
存在一些已知浏览器和可能会在浏览器的期望和它在压缩内容方面的收到中造成的不匹配的代理的问题。
There are known issues with browsers and proxies that may cause a mismatch in what the browser expects and what it receives with regard to compressed content.
考虑到对于一系列存在着答案的已知问题而言，只需作出如此微不足道的改变就已经足于解决了，问题是为何它们不在数年前就这样做呢？
With such a relatively trivial change for a known set of problems with the answer already in place, the question is why didn't they do so years ago?
如果您正在使用一个广泛使用的组件，就请考虑在Web上搜索一下，看是否存在已知的安全性问题，或者非正常使用的方法。
If you're using a widely-used component, consider doing a Web search to see if there are known security issues about it or common ways to unintentionally use it.
因此，有没有已知的多项式的解决这个问题，大多数人相信一个不存在。
Thus - there is no known polynomial solution to this problem, and most believe one does not exist.
研究了一个多值增算子的不动点问题，获得了几个存在性定理，所获结果推广了已知的结论。
Several fixed theorems for multivalued increasing operators are obtained, and the obtained results extend and improve the related known works in the literature.
借助相应带不定权特征值问题的第一特征值建立了其非平凡解的存在性定理，其中方程组中特征值参数小于某已知常数。
The existence of a nontrivial weak solution is established with the help of the first eigenvalue of the corresponding eigenvalue problem, where the eigenvalue parameter is less than a known constant.
在很多全局优化问题中，尽管目标函数和限制条件通常为非线性的，但仍会遇到某些参数和某些目标之间存在一些已知的单调关系。
In many global optimization problems, there exist some monotonous relations between parameters and some objectives, although the objective and constrain condition functions are nonlinear.
本文以两个自变量的拟线性双曲型方程的古尔沙问题为例，应用反函数和积分不等式证明了等价积分方程组解的存在唯一性，同时给出了解的存在区域和已知参量的依赖关系。
In this paper, we show the domain of the existence of the solution on Goursat problem for quasi—linear hyperbolic equation and obtain the Theorem of the existence and uniqueness in above domain.
第二个问题是，在太阳系外行星上，表明其他生命形式存在之可能性的环境是否存在，不管这些生命形式是已知的还是未知的。
The second question is whether conditions exist on exoplanets that suggest the possibility of other forms of life, whether known to us or not.
性能下降不可能被复制在测试环境中，但是潜在已知的问题是存在的。
Performance Degradation has not been able to be replicated in Oracle test instances, but potential for such problems is known to exist.
该方案从实用的角度出发，主要致力于解决移动机器人在全局静态环境已知，但存在未知障碍物（包括动态和静态）的一类环境下的路径规划问题。
To practical purpose, the solution tries to resolve the path planning problem of a certain kind of environment, which has static global environment with unknown-obstacles.
这几乎每个研究都存在的问题，甚至在控制已知混杂因素的研究中，其他的混杂因素依然受到人们的关注。
This is a problem in nearly every study, and even in studies controlling for known confounding variables, residual confounding remains a concern.
这几乎每个研究都存在的问题，甚至在控制已知混杂因素的研究中，其他的混杂因素依然受到人们的关注。
This is a problem in nearly every study, and even in studies controlling for known confounding variables, residual confounding remains a concern.
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