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  1. ... items may never get any further than the stomach, and are coughed up again. Many sharks have the ability to turn their stomachs...

    分類:科學及數學 > 生物學 2006年11月28日

  2. ...or drainage, sore or scratchy throat, sneezing, hoarseness, cough , and perhaps a fever and headache. The name of one bacterium... out instructions to warm things up , and if it gets too hot, the thermostat tries to...

    分類:科學及數學 > 生物學 2009年02月10日