unalterable       
adjective uk/ʌnˈɒl.tər.ə.bəl/ us/ʌnˈɑːl.tɚ.ə.bəl/
 无法改变的
not able to be changed
  He considered evil to be an unalterable fact of the world.
 Data stored in this system is unalterable and read-only. 存储在该系统中的数据不可更改,只能读取。 
 - More examples
 - It's wrong for lawyers to take a fixed and unalterable position, regardless of changing circumstances.
 - His books present changing perceptions rather than unalterable truths.
 - These are unalterable programs that govern the computer's standard operations.
 - Print copies of the newspaper are an unalterable historical record.
 - England were better in the second half but by then the direction of the match was unalterable.