 <translate> To answer this question, we should know that: The thoracic cavity consists of three cavities that fill the interior area of the chest. The answer is the interior area of the chest. <yor> Ká tó lè dáhùn ìbéèrè yìí, a gbọ́dọ̀ mọ̀ pé: Àwọn ihò mẹ́ta ló wà nínú àyà wa, wọ́n sì ń gba inú àyà wa. Ibi tó wà nínú àyà ni ìdáhùn náà wà. 