Yes, if water tests show that your drinking water contains pollutants or if it has an unpleasant taste or color.
是的，设想水测试显示你家里的饮用水含有污染物或水有难闻的味道或颜色。
Such tests, of course, must be applied without regard to race, creed, or color.
当然了，类似文化测试的应用必须不受种族、信仰和肤色的影响。
In lab tests using blood samples from human volunteers, the scientists showed that a drop of blood placed on the strip caused a color change that indicated blood type.
研究人员从志愿者身上采集血液样本用于试验，将血液滴在试纸上，根据试纸颜色的变化来区分血型。
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