フェムト秒 じゃありません
femutobyōjārimasen
1. Not a femtosecond.
Noun
#366576
1. Not a femtosecond.
1. (common) cold; influenza
1. snake
2. serpent; large snake
1. cowardly; timid
1. heart disease; heart trouble
1. then; well
1. hedge
1. skin disease