In the UK drinking water can contain no more than 100 micrograms of THM per litre. A microgram is one millionth of a gram.
在英国每升饮用水中三卤甲烷（THM）不允许超过 100 微克（ 一微克是一克的一百万之一）。
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Researchers say cancer-causing chemicals called trihalomethanes (THM) are created as a byproduct of chlorinating water and increase the risk of the disease developing.
研究者称氯处理过的水的副产品三卤甲烷（THM)，是一种致癌化学物，会增加患疾病风险。
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Taking a shower, having a long bath or going for a swim can increase the risk - albeit small - of absorbing THM through the skin, say the Spanish academics.