Making their work more complicated still, when a pool of water is suddenly found with potentially lethal doses of radiation, the other measurements are thrown into doubt.
一池水中突然被检测出带有可能足以致命的辐射，这使其工作变得更加复杂，也其他测量数值陷入质疑。
More serious still is a new mood of self-doubt.
更加严峻的是新生的一种自我怀疑的情绪。
More than 100 years after the first Labor day observance, there is still some doubt as to who first proposed the holiday for workers.
第一次庆祝劳动节超过100年后，仍然有一些怀疑谁首先提出了工人的假期。
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