The security issues are integrated into DToC, rather than travelling through other layers and translations that you need to configure separately.
安全性问题被集成到DToC中，而不是通过需要分别配置的其它层和转换。
Travelling on these lines was inconvenient, though, as each line was separately owned and many were very far from each other.
然而搭乘这些线路很不方便，因为每条线都分别各归其主而且许多线路之间相距甚远。
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