The guards back out of the cell block and lock the gate behind them.
警卫退出了牢房区，锁紧了牢房区出入的门。
2
Mariantoni's group has used the new system to run an algorithm that is a kind of computational building block, called a Toffoli gate, which can be used to implement any conventional computer program.
East downtown began its transition to a semi-residential neighbourhood in 1997 when the MCI Center (now the Verizon Center) opened one block from the Chinatown gate on 7th and H Streets.