安全部队已经确认了本案的主要嫌疑人。

Security forces have identified the ___prime suspect in the case.

这份文件是这一历史事件的主要证据来源。

This document serves as a ___prime source of evidence for the historical event.

总统的车队被认为是这次袭击的主要目标。

The president's motorcade was considered a ___prime target for the attack.