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| 纤维环 (包括三尖瓣环、二尖瓣环、肺动脉瓣环和主动脉瓣环，分别围绕右房室口、左房室口、肺动脉口和主动脉口，有瓣膜附着。肺动脉瓣环和主动脉瓣环常不完整，纤维环有固定瓣膜的作用) | |||
| 纤维环 | |||
| fibrous ring: 6 phrases in 4 subjects |
| Otorhinolaryngology | 1 |
| Sports | 2 |
| Surgery | 1 |
| Technology | 2 |
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