long wave

US /ˈlɔŋ weɪv/
UK /ˈlɔŋ weɪv/
"long wave" picture
1.

長波

a radio wave of a wavelength greater than 1,000 meters (frequency less than 300 kHz), used for long-distance communication.

:
Ships at sea often rely on long wave radio for navigation and communication.
海上船隻常依賴長波無線電進行導航和通信。
The old radio could pick up stations on the long wave band.
那台舊收音機可以接收長波波段的電台。