1. 退格： 是回车换行(newline)是退格(back space)外部变量(external variable)和yacc源程序中要用到的全局变量都在这部分定义,例如:yycc生成的语法分析程序yyparse用的是LR分析方法,它在作语法分析时除了有一个状态钱外,还有一个语义值钱,
2. 退格符：back sight 过天顶测天瞄准器 | back space 退格符 | back space 退格
3. 刪字：刪歌:DELETE | 刪字:BACK SPACE | 關閉小鍵盤:ESC
4. 退位：www.mapeng.net 马棚网 | back space ==> 退位 | back space file ==> 回退文件
1. back space
1. All six of the astronauts China has sent into space since 2003 have come back to earth safe and sound.
2. I'd probably get so high I probably wouldn't come back if I fell into that kind of space.
3. Thousands of people flocked to a Beijing landmark on Saturday to admire the space capsule that brought China's first astronaut back to Earth.
4. Possible scenarios include crashing into the moon like its predecessor, flying into deep space or flying back to Earth.
5. Designed only to support free flight between Earth and space and back, that unit has only enough storage capacity for a few days of crew use.
6. Once that had been accomplished, funding was cut back considerably and robotic space missions took over.
7. For $ 150 billion, the National Aeronautics and Space Administration could have sent astronauts back to the Moon.
8. Endeavour is due back at the Kennedy Space Center in Florida on Tuesday.
9. The spaceship would glide back to Earth much like the space shuttle.
10. Psychologically, the pull for Ansari is in the opposite direction back to space.