Cryptogenic
a. 起因不明的
🗣️ 情景例句
and from the University of Michigan in 1956.
一九五六年从Michigan大学毕业。
No pain, no gain.
不劳则无获。
It broke down at Ferngreen station and was taken off the line.'
它在芬格林车站出了故障而被取消了。”