缺点：官方支持的应用程序数量有限，保守的基本包的选择范围；复杂的升级过程。
Cons: Limited number of officially supported applications; conservative in terms of base package selection; complex upgrade procedure.
源码型病毒是最少见的病毒程序，因为它们不仅编写困难，而且与其他类型的病毒相比，受它们破坏的主程序数目也有限。
Source code viruses are the least-common viruses because they are not only hard to write, but also have a limited number of hosts compared to the other types.
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