Commutator and brushes shall be free of grease, or other contaminants.换向器和炭刷应无脂或其他污物.Caesium is one of the radio - contaminants discharged from nuclear power plants.铯是核电站排放的放射性物质之一.We are exposed to an overwhelming numbe...
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...