N-COUNT
征兆；预兆；兆头
If you say that something is an omen, you think it indicates what is likely to happen in the future and whether it will be good or bad.
例句
Her appearance at this moment is an omen of disaster...
她在此刻出现预示着一场灾难。
Could this at last be a good omen for peace?
这是否终于可以视作和平的吉兆了？