the anterior part of an insect's thorax; bears the first pair of legs
prothorax详细解释
pro.tho.rax
n.(名词) 【复数】pro.tho.rax.es 或 pro.tho.ra.ces [-thôr.…-sôz., -thôr.-] The anterior division of the thorax of an insect, bearing the first pair of legs. 前胸:昆虫胸部前面的一节,第一对足就长在该处