Contaminants found in poultry will also be found in their eggs.家禽身上发现的污染物，在禽蛋里也会有。Filters do not remove all contaminants from water.过滤器无法过滤掉水中的所有污染物。We are exposed to an overwhelming number of chemical contaminants every...
He contended that there must be life on Mars.他坚信火星上面一定有生物.Three students contended for the prize.三名学生竞争这个奖品.Sisters contended about silly trifles.姐妹们为鸡毛蒜皮的小事而争吵....