Back door
01
后门, 后门
a door that is located behind or at the side of a building
例子
The delivery person knocked on the back door, carrying packages for the kitchen staff.
送货员敲了敲后门，为厨房工作人员送包裹。
Children raced through the back door, eager to play in the backyard on a sunny afternoon.
孩子们从后门跑过，渴望在一个阳光明媚的下午在后院玩耍。
02
后门, 秘密入口
a secret or underhand means of access (to a place or a position)
03
后门, 隐藏访问
an undocumented way to get access to a computer system or the data it contains
