query: الباحثين لاحظو بلورات تتشكل في بول القطاطس كي نزيدو الميلامين وحمض السيانوريك.
positive: The researchers observed crystals formed in cat urine by the addition of melamine and cyanuric acid.
negative: The researchers did not observe crystals formed in cat urine by the addition of melamine and cyanuric acid.