早口言葉
⇒「21世紀最初のこの分かりにくい戦争」 ラムズフェルド長官会見(gooニュース) - goo ニュース
There are known knowns;
there are known unknowns;
and there are unknown unknowns.
⇒「21世紀最初のこの分かりにくい戦争」 ラムズフェルド長官会見(gooニュース) - goo ニュース
There are known knowns;
there are known unknowns;
and there are unknown unknowns.