词典释义：
释义
n.
the door or entrance at the back of a building
（建筑物的）后门。
[as modifier]achieved by using indirect or dishonest means
开后门的；不正当的
-
a back-door tax increase .不正当的税收增长。
a feature or defect of a computer system that allows surreptitious unauthorized access to data
（计算机系统中的）后门。
短语
-
by （或through ）the back door using indirect or dishonest means to achieve an objective 开后门；用不正当途径
