校園lockdown的意思：限制。
lockdown
英 [?l?kda?n] 美 [?lɑ?kda?n]
n.活動（或行動）限制。
Prisoners have been placed on lockdown to prevent further violence at the jail.
已對囚犯實行活動限制，以免獄中再出現暴力行為。
People, we're going into a lockdown situation.
各位，現在封鎖警局。
The city should return control of it to you and end the lockdown.
城市將會解除鎖定，把控制權交還給妳們。
And I need what every man needs when he's coming off the lockdown.
我需要任何壹個剛從監獄出來的男人都要的。