Our certificate of quality is made alid by means of the official seal .

我们的质量证明书盖公章方为有效。

Because there were too few cases in thailand for a alid statistical interpretation , the researchers excluded the thai cases from the final analysis .

由于泰国的病例太少无法进行有效的统计学解释，研究者将泰国的病例从最终的分析结果中排除掉。

A preliminary blood screening could reduce some of the demand , experts said-if the test proes alid in larger studies and receies federal approal .

有关专家认为，如果血液检测在大量研究中证实有效并获联邦通过，初步血液检测筛查可减少这些结肠镜检的需要。