单位退格字元 unit backspace character: 单位退格符unit, backspace character(ubs): 单位退格字符unit,backspace character(ubs): 单位退格字符backspace character: 反回符号; 返回符号; 退格符号,返回; 退格键character backspace: 退格字元下载手机词典可随时随地查词查翻译