intrusive viruses的用法和樣例：
例句
- Intrusive viruses invade an existing program and actually insert a portion of themselves into the host program.
入侵型病毒侵入已有的程序，實(shí)際上是把病毒程序的一部分插入到主程序中。 - Intrusive viruses are hard to write and very difficult to remove without damaging the host file.
入侵型病毒難以編寫(xiě)，在去除它們時(shí)常常會(huì )破壞主文件。
