public-addressCOCA⁶⁹⁹⁸³BNC¹⁷³⁹⁹⁵⁺² 基本例句 un.扩音机🌏公共地址 The cones of larger loudspeakers used in traditional public-address systems vibrate more slowly, making them better suited for sounds in the range of human hearing. 传统播音系统使用的大型扩音器中的椎体振动较为缓慢，使声音更加适合人类听觉范围。 yeeyan