to block off
[动词]
to prevent entry or access by placing a barrier

封锁, 阻挡
Ex: The blocked off the restricted area .
to log off
[动词]
to stop a connection to an online account or computer system by doing specific actions

登出, 退出
to stand off
[动词]
to prevent a potential attacker from approaching by taking on a defensive posture

抵挡, 制止
Ex: The hikers were instructed on how stand off any aggressive wildlife encounters by making themselves appear larger .
to turn off
[动词]
to cause a machine, device, or system to stop working or flowing, usually by pressing a button or turning a switch

关闭, 关掉

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