YOU SAID:
Muted sirens spoiled my birthday.
INTO JAPANESE
静かなサイレンのせいで私の誕生日は台無しになった。
BACK INTO ENGLISH
My birthday was ruined by a silent siren.
INTO JAPANESE
私の誕生日は静かなサイレンによって台無しになりました。
BACK INTO ENGLISH
My birthday was ruined by a silent siren.
That didn't even make that much sense in English.