他曾当过兵这一事实是可信的。
The fact that he once joined the army is believable.
youdao
我以前当过兵，现在我是个木匠。
I was a soldier and I am a carpenter now.
我曾经当过兵，多么自豪、多么幸福！
I have ever served as soldier. how proud, how happy.
他年轻时当过兵。
In his youth he was a soldier.
对帕特里克这些当过兵的人来说，那曾是他们的目标。
ForPatrick, having been in the Army, that was their mission.
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