It was an unfortunate accident.
那是一次不幸的事故。
是一个不幸的意外。
Suffered an unfortunate accident.
遭遇到不幸的事故。
By an unfortunate accident the actor was stabbed in reality, and not merely in show.
由于一次不幸的意外事故，那位男演员不仅仅是在表演遇刺，而是真正被刺伤了。
It was unfortunate that there should be such an accident.
不幸事故之后，我一直睡得很不好。
It was unfortunate that there should be such an accident.
不幸事故之后，我一直睡得很不好。
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