a subject or issue about which someone feels distressed or annoyed and which it is therefore advisable to avoid in conversation with them(谈话中应当回避的)痛处(或伤心事)
stand (或 stick) out like a sore thumb
be very obviously different from the surrounding people or things显得很不自然;与周围的人(或事物)格格不入
柯林斯高阶英汉双解学习词典释义
ADJ-GRADED
疼的;疼痛的
If part of your body is sore, it causes you pain and discomfort.