首先，UDP是无连接的。
由于IP是无连接的服务，所以没有明显的连接状态。
Because IP is a connectionless service, no explicit connection status is available.
是一个无连接的UDP协议，因此，它可以很容易地欺骗。
UDP is a connectionless protocol and, as such, it can be easily spoofed.
另外，无连接的传输服务与无连接的网络服务也非常类似。
Furthermore, the connectionless transport service is also very similar to the connectionless network service.
结构独特、无键连接、高铬板锤、独特的反击衬板；
Special structure, keyless connection, high-chromium plate hammer, particular impact liner;
时有时无的网络连接使故障查询工作更加困难。
The up and down network connectivity makes the troubleshooting matter even worse.
时有时无的网络连接使故障查询工作更加困难。
The up and down network connectivity makes the troubleshooting matter even worse.
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