Gerridae

例句：

1. 1.The hounds were trained to track down criminals in the city.
   这些猎犬被训练用来追踪城市里的罪犯。
2. 2.The dog's keen sense of smell is a valuable asset for a police officer.
   狗敏锐的嗅觉对于一名警察来说是一个宝贵的资产。
3. 3. The family had a pet German Shepherd named Max.
   这个家庭养了一只名叫Max的德国牧羊犬。