query: فما طرق مختلفة باش تنقي الماء، بعضها مجدية أكثر ضد تهديدات معينة.
positive: There are different ways of purifying water, some more effective against specific threats.
negative: There are like ways of purifying water, some less ineffective against general threats. There are not different ways of purifying water, some more effective against specific threats. There are same ways of purifying water, some more ineffective against general threats.