sally port

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释义
边门，旁门
An entryway controlled by two doors or gates, of which each must be closed before the other can open.

例句
Franklin: Scofield must have a way.
Westmoreland: He did. The grate at the sally port.(Prison Break)
富兰克林：斯科菲尔德一定有其他路。
莫兰：他确实有，就是旁门的铁栅栏（越狱）