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- Keloid (KD) is a dermal fibroproliferative tumor of unknown aetiology, also unique to humans frequently met in plastic surgery. 瘢痕疙瘩(Keloid，KD)是病因不明的皮肤纤维增生瘤，是仅与人类相关的整形外科常见病症。 既可由微小的损伤如蚊虫叮咬、痤疮、穿耳孔引起，也可因烧伤、创伤、手术所致；
- Multiple sclerosis(MS)which has unknown aetiology and etiopathogenesis,is a chronic,autoimmune disease of the central nervous system(CNS). 多发性硬化(MS)是中枢神经系统常见的慢性炎症性自身免疫性疾病,目前病因及发病机制尚不清楚。
- Sarcoidosis is a multisystem granulomatous disorder of unknown aetiology and establishing the correct diagnosis can be challenging. 结节病是一种多系统肉芽肿性病变，病因不明，诊断困难，多于30-40岁发病。
- Subarachnoid Hemorrhage of Unknown Aetiology:A Clinical Analysis of 42 Cases 不明原因的蛛网膜下腔出血(附42例临床分析)
- Early antiplatelet and antithrombotic therapy in patients with a history of recurrent miscarriages of known and unknown aetiology 习惯性流产患者早期抗血小板及抗血栓形成治疗
- The leading role is played by a complete unknown. 演主角的是一个毫无名气的演员。
- The star of the film is a previously unknown actor. 这部电影里的明星以前是个默默无闻的演员。
- Its greater part is unknown to me. 它的大部分对我是未知的。
- He was an unknown painter one year ago. 一年前，他还是一个不为人知的画家。
- a headache of unknown aetiology 原因不明的头痛
- This is a fact hitherto unknown. 这是一个至今无人知道的事实。
- A quantity of unknown numerical value. 未知数数值不明的一个数量
- Kate is in bad with Lucy for some unknown reason. 因为某些不为人知的原因，凯特和露西关系不好。
- We use x as the symbol for an unknown quantity. 我们用x表示一个未知数。
- It is no safe wading in an unknown water. 不知水深浅，涉水不安全。
- The investigation was tabled for reasons unknown. 不知何故调查延缓进行。
- The ownership of the house is still unknown. 这栋房子的所有权至今无人知道。
- The unknown number can be calculated from the data. 通过已知数可以算出未知数。
- Many unknown writers aspire to fame. 许多不知名的作家渴望成名。
- He was an unknown novelist then. 当时他是位不出名的小说家。
