YOU SAID:
He is the canary in the coal mine.
INTO JAPANESE
彼は、炭鉱のカナリアです。
BACK INTO ENGLISH
He is a Canary in the coal mine.
INTO JAPANESE
彼は、炭鉱のカナリアです。
BACK INTO ENGLISH
He is a Canary in the coal mine.
That didn't even make that much sense in English.