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  1. ...the production of excess respiratory tract fluid which presumably is easier to cough up . It is the active ingredient in many antiperspirants, usually...

    分類:科學及數學 > 化學 2007年09月30日

  2. ... impaired, also leading to chronic coughing . Smokers are 10 times as likely to...artery walls. All of these effects add up to an increased risk of heart attack. In addition...

    分類:科學及數學 > 化學 2008年05月22日