impenetrability
n. 不能通过,不能穿过
1. resistance to penetration by a liquid
2. incomprehensibility by virtue of being too dense to understand
Part of the problem is that the Internet was developed for interoperability, not impenetrability.
造成这个问题的部分原因是因特网当初为互用性而不是为抗入侵能力开发的.