Pbx
[计] 专用小型交换机
🗣️ 情景例句
Five, five, five, seven, five, three, two.
5557532。
Eagles fly alone, but sheep flock together.
鹰单飞，羊群集。
it must be known to any kind of radio astronomer in the universe.
这个频率是宇宙中任何射电天文学家都应该熟悉的。