A police dog picked up the murderer's scent.

一条警犬嗅出了凶手的气味。

Uncle Sam's war dog sentries have seen their first overseas duty in Puerto Rico. "Adrian" the police dog sentry can't wait to leave his portable kennel.

山姆大叔的哨兵犬在波多黎各首次执行海外任务。警犬“阿德里安”迫不及待地想离开它的便携式狗窝。

The police dog scented about till he found the trail.

警犬嗅来嗅去， 终于找到了踪迹。

A police dog follows a scent.

一条警犬在追踪着气味。

A police dog follows a scent.

一条警犬在追踪着气息。