Double ring zoom雙環(huán)式變焦鏡頭
double ring antenna雙環(huán)天線
Double Ring ceiling fan雙環(huán)牌吊扇
double ring astern加速后退;再退三
double ring ahead再進(jìn)三;加速前進(jìn)
Double ring偽年輪;繡花圈;宇宙雙鷹
double ring full ahead雙車前進(jìn)三
double-ring valve雙環(huán)閥
double ring full astern雙車后退三