Another option is to use RCS's ci and co commands to create a change history for each file.
另一种选择是使用RCS的ci和co命令为每个文件创建更改的历史。
2
Other Arab states, especially the monarchies, have so far parried calls for change with seeming success, using the familiar mix of coercion, co-option and promises.
其它阿拉伯国家、特别是君主国以惯用的威吓、收买与许愿等手段齐上，似成功压制了民众变化的诉求。
3
The co command's -l option locks the file so that you (and only you) can edit it.