well the answer is still in the link I sent you to :). Meaning this one http://www.yiiframework.com/doc/guide/1.1/en/topics.i18n You can have parameters sent that take 1 translation or another. For example
Yii::t('app', 'n==1#one book|n>1#many books', 1);
You can always create a condition like
Yii::t('app', 'n==1#translation of BBBx|n>1#translation of BBBy', 1);
to get "translation of BBBx" and
Yii::t('app', 'n==1#translation of BBBx|n>1#translation of BBBy', 2);
To get "translation of BBBy"