Visiting several Washington area think tanks, you quickly discover that security is tight. Even if you have made an appointment ahead of time, you still have to go through a number of security barriers.
走訪幾家位於華府的美國智庫，可發現這些地方門禁森嚴更勝政府機關，連已經約好的來客，都還得經過層層的保全關卡。