1)backspace character (BS),退格字符2)backspace character (BS),退格（字）符3)backspace (BS),退格4)rhyme scheme of to-and-fro,进退格5)backspace character,退格符6)backspace mechanism,退格机构
英汉例句
The rhyme scheme of to-and-fro is a sort of tonal pattern that Zheng gu and other poets developed for modern "Cstyle poetry in the late Tang Dynasty.
