警戒严密的

There is a tight security cordon around the area.

区周围设有严密的安全警戒圈。

She can walk through the tightest security check point.She can directly go to Uplight's office.But she was feared to do so.

她能通过最严密的安全警戒系统，能直接到兰皮的办公，但她害怕去那里。