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酸
1
to say time and time again; to say till you're blue in the face
Examples
口をすっぱくして言ったのに。
I told you again and again.
1
Idiomatic expression; Usu. as 口を酸っぱくして言う
to repeatedly admonish; to tell over and over
1
carbon monoxide
Examples
一酸化炭素とは炭素化合物の不完全燃焼で発生する有害物質です。
Carbon monoxide is a poisonous substance formed by the incomplete combustion of carbon compounds.
