专家们准确地指出了问题的根源。

Experts ___pinpointed the exact source of the problem.

医生通过先进的扫描技术精确地确定了肿瘤的位置。

The doctor ___pinpointed the exact location of the tumor using advanced scanning technology.

工程师精确找出了系统故障的原因。

The engineer ___pinpointed the exact cause of the system failure.