膝盖

• ピンイン: xī gài
• 漢字の分解: 膝 = 月(flesh radical) + 桼 (phonetic component — indicating knee area); 盖 = 艹 + 盍 (grass/cover + covered vessel — a lid or cap)

意味

膝（ひざ）、膝蓋（しつがい）

Common in medical, sports, and everyday contexts. Often appears in phrases about kneeling, injuries, or joint health. 膝 is the formal character; 膝盖 is the colloquial compound used in everyday speech.

例文

1. 他在篮球训练中扭伤了膝盖，不得不暂停训练接受治疗。
2. 长时间跪坐会对膝盖关节造成不必要的压力，建议每隔一段时间起身活动。
3. 运动员在高强度训练后常常进行冰敷，以减轻膝盖周围的肿胀和疼痛。

使い方ガイド

場面: medical, sports, everyday, anatomy

トーン: neutral

正しい言い方

• 医生检查后说，这位长期重体力劳动者的膝盖半月板已明显磨损，若不及时保守治疗，可能要手术。(After the examination, the doctor said that this long-time heavy laborer’s knee meniscus was already badly worn, and if conservative treatment was not started in time, surgery might be needed.)
• 研究表明，跑步时前脚掌着地比脚跟着地更能减轻膝盖冲击，所以教练常建议系统矫正跑姿。(Studies show that landing on the forefoot while running reduces impact on the knees better than heel striking, so coaches often recommend systematic gait correction.)

避ける言い方

• 膝盖 in very formal medical writing where 膝关节 (knee joint) is the precise anatomical term — while 膝盖 is universally understood, formal clinical reports and anatomical descriptions typically use 膝关节 to refer specifically to the joint structure

起源と歴史

膝 = 月(肉) + 桼 (body flesh radical + lacquer tree — knee joint area of the leg); 盖 = 艹 + 盍 (cover — lid/cap, here meaning the kneecap covering the joint)

文化的背景

世代: All ages

社会的背景: Universal