Where does the signal, VNA, originate?

VNA开头的信号是从哪里来的？

William de Morgan went out of business many, many years ago but then I met the tile curator at the VNA and he told me that there was one place that still made them and it was Kenneth Clark Tiles.

威廉·德·摩根很多很多年前就倒闭了，但后来我遇到了越南新闻社的瓷砖馆长，他告诉我还有一个地方在生产那些瓷砖，那就是肯尼斯·克拉克瓷砖公司。