of unknown etiology

• 病原不明的

of unknown etiology的用法和样例：

例句

1. The apocryphal story of Columbus and the egg is very interesting.
   哥伦布竖蛋这个真伪不明的故事十分有趣。
2. But anyhow, I still love, sex unknown love, suffering or cruelty of love, after all, is love.
   可是我终归还是爱的，性别不明的爱，痛苦或是暴虐的爱，终归是爱的。