1N-COUNT [usually singular]胸部;胸腔;胸廓 Your thorax is the part of your body between your neck and your waist. 胸部;胸腔;胸廓 [medicine]
2N-COUNT [usually singular](昆虫的)胸部,胸节 An insect's thorax is the central part of its body to which the legs and wings are attached. (昆虫的)胸部,胸节 [technical]