So, we have stomachache, we have headache we have earache, you can have a backache, a side ache, where the side of your body aches; all of these are ways of describing a part of your body that hurts.
所以,我们有胃痛, 我们有头痛, 我们有耳痛, 你可能有背痛,侧痛,你身体的一侧疼痛;所有这些都是描述你身体疼痛部位的方式。