例句與造句

1. hdsl uses two twisted copper pairs to achieve two-way rate symmetric communications; sdsl is similar to hdsl in function, but only needs one twisted copper pair in providing rate symmetric services; idsl ( isdn dsl ) provides 128 kbps two-way rate symmetric services
   速率對(duì)稱型的xdsl有idsl、hdsl、sdsl(singlelinedsl)、hdsl2等多種形式，hdsl采用2對(duì)雙絞銅線實(shí)現(xiàn)雙向速率對(duì)稱通信。sdsl的功能與hdsl相同，但僅用一對(duì)銅線即可提供速率對(duì)稱型通信。idsl（isdndsl）提供128kbits雙向速率對(duì)稱型通信業(yè)務(wù)。
2. It's difficult to find symmetric communications in a sentence. 用symmetric communications造句挺難的