Weapons are instruments of ill omen.武器是不祥之物。

But now, like a black bird of ill omen, here was the man once more.可是现在, 那个人像只晦气的黑鸟一样又来了。

He's a loser, a bird of ill omen, dangerous to be around.他是个失败者, 也是个扫帚星, 在他身边很危险。