If something that has happened was unforeseen, it was not expected to happen or known about beforehand.
例句
Radiation may damage cells in a way that was previously unforeseen...辐射可能以一种我们过去未能预见到的方式破坏细胞。Unfortunately, due to unforeseen circumstances, this year's show has been cancelled...遗憾的是,由于一些意外情况,今年的演出被取消了。
英汉词典释义
adj.
未预见到的, 意料之外的
This was a sudden and unforeseen blow.这是一个意想不到的打击。This was an unforeseen complication.这是未预见到的复杂情况。
英英词典释义
Adjective
1. not anticipated;
"unanticipated and disconcerting lines of development"- H.W.Glidden"unforeseen circumstances""a virtue unlooked-for in people so full of energy""like a bolt out of the blue"
2. happening or coming quickly and without warning;