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用漂白剂泡一会就褪色了。摘抄一段:
Another cause of pink stains is a type of airborne bacteria called Serratia marcescens, which occurs naturally in food, soil and animals. It thrives on moisture and feeds on itself, so it doesn't need a particularly accommodating host to survive. It's commonly found during construction or remodeling projects, which tend to stir up dust containing this bacteria, but it can also enter through an open window in the summer. It's generally found to be harmless for healthy people, though it has been linked to urinary tract infections and pneumonia. Chlorine bleach is the easiest way to keep the pink stains at bay. Be sure to keep sinks wiped down so that water doesn't pool and beckon the bacteria.
总之是一种常见细菌,容易在小水洼/潮湿处滋生。红色是它的代谢产物,叫灵菌红素。这是一种条件致病菌,大部分情况无害。
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