And similarly old crystal radio sets and more recently modern radio frequency identification (RFID) tags, increasingly used in shipping and as antitheft devices, are powered purely by radiowaves.

同样，老式晶体管收音机，以及日益普及于航运及防盗装置上的，更新式的现代无线射频识别技术(RFID)，都是仅仅从无线电波中获取能量。

youdao

The roll is increased and severer than shipping state when the frequency of wave is similar as the natural rolling frequency of ships.

船舶在系泊或低航速状态下，当涌浪周期接近船舶自然横摇周期时，船舶摇摆比航行时更为剧烈。

youdao

If there is still no response, a distress alert will be transmitted on the emergency frequency to the nearest coastguard and nearby shipping.

BBC: Alan Rankin on his yacht Trade Winds

Radio-frequency identification (RFID) tags used for tracking items like shipping containers and pallets of goods have been around for years.

ECONOMIST: Tech.view