片语
be taken when necessary必要时服用
make donations when necessary在必要的时候捐献
Except When Absolutely Necessary除非必须
Only when absolutely necessary仅仅在绝对必要的时候
Overtime work when necessary公司需要时能加班
dispatch when necessary原话不记得了
Employment when necessary自如就业
Maintain documentation when necessary维护所需的文件
courageous when necessary八进制