一个既不复制也不拷贝自己，但却可以损害或者危及电脑安全的一种程序。
A program that neither replicates or copies itself, but does damage or compromises the security of the computer.
特洛伊木马——这种程序在进入系统时并不复制自己，但可以被用来打开系统的“后门”。
Trojan Horse - a program that doesn't replicate when entering a system but can be effectively used to open 'back doors. '
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