culprit|culprits

监控录像帮助警方很快就找到了偷手机的罪犯。

The surveillance footage helped the police quickly identify the ___culprit who stole the phone.

过度使用手机和熬夜是导致他疲劳的主要原因。

Excessive phone use and staying up late are the main ___culprits behind his fatigue.

经过检查，我们发现漏水的水管是地下室潮湿的罪魁祸首。

After inspection, we found the leaking pipe was the ___culprit behind the dampness in the basement.