A demonstrable link between smoking and lung cancer .

抽烟和肺癌之间有明显的联系。

" Something having real , demonstrable existence "

有真实的、可论证的存在的事物。

Must knowledge be demonstrable to be valuable ?

知识一定要被证明是有价值的？

In this case , it 's a statistically demonstrable fact .

这件案子中,这是统计证实的事实.

The recent series of government packages , notwithstanding their scale and speed , has had little demonstrable effect on the level of confidence or the outlook for ongoing activity .

最近各国政府祭出的一系列经济救援计划，虽然规模庞大、行动迅速，但是对于信心水平和现行经济活动的前景并没有多少显而易见的影响。