C Company's sentries were just ahead.是什么意思？

C Company's sentries were just ahead.

C连的哨兵就在前头。

sentries

n. 哨兵，步兵( sentry的名词复数 )；

例句
C Company's sentries were just ahead.
C连的哨兵就在前头。

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

just

adv. 刚才，仅仅，只是，正好，刚要；adj. 公正的，合理的，恰当的，合法的，正确的；

例句
It became very clear that the incident was not just an aberration, it was not just a single incident.
事实已经很清楚，这件事不是偶发的，它并不是一起孤立的事件。

ahead

adv. 在（某人或某事物的）前面，向前，预先，在将来，为未来；

例句
I peered ahead through the front screen...
我透过面前的挡风玻璃凝视前方。