spot field investigation

例句：

1. 1.The team conducted a spot field investigation to gather data on the local wildlife.
   团队进行了一次现场调查，以收集当地野生动物的数据。
2. 2. During the investigation, they discovered a hidden tunnel leading to an underground cave.
   在调查过程中，他们发现了一条通往地下洞穴的隐蔽隧道。
3. 3. The detectives conducted a spot field investigation to identify the culprit behind the recent thefts.
   侦探们进行了一次现场调查，以确定最近几次盗窃事件的嫌疑人。