This plan is only used at normal times,special conditions are not included.（这句比较口语化）
This plan is only applied under normal conditions,excluding special ones.(这句比较正式)
英语翻译用英语表达：这个计划只在平时使用 特殊情况另算
This plan is only used at normal times,special conditions are not included.（这句比较口语化）
This plan is only applied under normal conditions,excluding special ones.(这句比较正式)