フェムト秒 ではありません
femutobyōdewārimasen
1. Not a femtosecond.
Noun
#365681
1. Not a femtosecond.
1. cowardly; timid
1. heart disease; heart trouble
1. hedge
1. skin disease
1. second (unit of time)
2. arc second
1. adult diseases
1. countdown
1. Minamata disease