我们在公共卫生受到挑战的时刻相会，目前充满了不确定因素，面临真实而不可测的风险。
We are meeting at a challenging time for public health, full of uncertainties and real but unpredictable risks.
不稳定、不确定和不可测因素增加。
Unstable, uncertain and unpredictable factors are increasing.
根据麦肯锡的计算，当其他因素相同的情况下（几乎可以确定不可能），到2025年全球产出将增加12万亿美元。
That would add $12 trillion to global output by 2025, according to McKinsey's calculations, other things being equal (which they almost certainly will not be) .
被访的专家认为到2030年之前不可能搞清楚云团及其它不确定因素的影响——即使投入这类研究的资金在未来20年中增加3倍也不行。
The interviewed experts don't expect to be any more able to understand clouds and the other uncertainties by 2030-even if funding for such research were tripled in the next 20 years.
在地形复杂地区，物探异常的准确定位不可避免地受地形因素的影响。
For the regions of complex topography, the accurate orientation of geophysical anomaly unavoidably is influenced by the landform.
确定因素太多，我们不可能实现定销。
Too many uncertain factors prevent us from being able to predict the sales volume.
摘要：影响位置跟踪精度最重要的因素之一是系统不可避免地存在内外不确定性。
Abstract: One of the most important factors to depress the accuracy of position tracking is the internal and external uncertainties always existing in the system.
这是不可能的，以确定这些事件是否直接相关的DE5抑制剂或其他因素。
It is not possible to determine whether these events are related directly to the PDE5 inhibitors or to other factors.
这是不可能的，以确定这些事件是否直接相关，这些药物或其他因素。
It is not possible to determine whether these events are related directly to these medicines or to other factors.
一项成功的协议取决于若干核心因素，其中有两项已确定为必不可少：首先，所有的主要经济体应制定强有力的国家行动方案并决心付诸实施；
A successful agreement depends upon a number of core elements, but two are shaping up to be essential: first, that all major economies set forth strong national actions and resolve to implement them;
一项成功的协议取决于若干核心因素，其中有两项已确定为必不可少：首先，所有的主要经济体应制定强有力的国家行动方案并决心付诸实施；
A successful agreement depends upon a number of core elements, but two are shaping up to be essential: first, that all major economies set forth strong national actions and resolve to implement them;
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