Water should be regularly chlorinated in public swimming baths to keep it pure.
公共游泳池水应定期使用氯气消毒,以保持干净。
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A lot of contaminants, like lead or arsenic, won't be obvious without tests, but some clues, like cloudiness, brown or yellow coloration, a foul odor, or an excessive chlorine smell can indicate the need to investigate further.
许多污染物,如铅或砷,如果不进行测试就不会很明显,但一些线索,如混浊、棕色或黄色、恶臭或过多的氯气味,可能表明需要进一步调查。