胸膛
xiōng táng · HSK 7
chest
胸 chest + 膛 body-cavity (月 flesh + 堂 hall) = the hollow hall of the chest
膛 pairs the 月 flesh radical with 堂 táng (hall), and it even borrows that sound: táng. So 胸膛 reads as the chest's inner hall, the bony hollow that houses the heart and lungs.