Car emissions contain lead, for instance, and according to a study by the department of public health at National Taiwan University, the lead content of mothers 'milk is three times higher than it was 20 years ago.
例如汽車排放物中含有重金屬「鉛」，國外一份研究調查指出，今天餵乳母親身體的含鉛量是廿年前的三倍。