trace standard certified of agricultural chemicals

例句：

1. 1. The detective traced the criminal's movements using surveillance footage.
   侦探利用监控录像追踪了罪犯的行动。
2. 2. The scientist traced the origin of the virus through genetic analysis.
   科学家通过基因分析追踪病毒的起源。
3. 3. The police are trying to trace the missing child to its last known location.
   警方正试图追踪失踪儿童最后已知的位置。