In RFC 3262, a mechanism was developed to ensure that the responses are sent reliably and acknowledged alone so that the status of the call is not lost if the transport protocol is something like UDP.

在RFC 3262中，开发了一项机制来确保可靠地发送消息，且仅为确认目的而发送，以便在使用udp之类的传输协议时不会丢失呼叫状态。

youdao

Well, anyway, he'd somehow lost his wallet and his house keys, so he couldn't get in. He lives alone, you know.

噢，反正他就是弄丢了钱包和家里的钥匙，所以没办法进门。你也知道，他是一个人住。 。

youdao

Black, black, the nights I have known, Longing for you so lost and alone.

黑色啊，黑色，我的夜晚是黑色的，想念你，在迷惘和孤独中想念你。

youdao

Once in awhile in our more reflective moments we may ponder why there should be such things that cause so much suffering and sorrow in the world, let alone so much lost productivity.

FORBES: This Is the Season?