Cellphone companies, as well as television and radio broadcasters, use patchworks of towers to transmit their signals.
无线通讯公司以及电视和广播公司都通过一系列发射塔来传输自己的通讯、节目信号。
3
Channels through the Canadian Arctic archipelago that were choked with ice at this time of year two decades ago are now expanses of open water or vast patchworks of tiny islands of melting ice.