YOU SAID:

One dozen out of three dozen are already broken unfortunately.

INTO JAPANESE

残念ながら３ダースのうち１ダースはすでに壊れています

BACK INTO ENGLISH

Unfortunately, one of the three dozen is already broken.

INTO JAPANESE

残念ながら、３ダースのうち１ダースはすでに壊れています。

BACK INTO ENGLISH

Unfortunately, one of the three dozen is already broken.