未成的英文：
fail of

参考例句：

He ruled this kingdom during the minority of a sovereign.
他在君主未成年时统治着国家。

Affair still not yet settled
事尚未成

I pleaded for him in vain.
我为他辩护未成。

Catch the bear before you sell his skin
大事未成时,莫开庆功宴

A person is not liable for debt contract during his minority.
一个人不能对他在未成年期合同债务承担责任。

Law and order were quickly restored after the attempted revolution
那次革命未成之后,法律和秩序迅速恢复了。

Mrs. Norris began to look about her and wondered that his falling in love with Julia had come to nothing.
诺利斯太太环顾左右，为他和朱丽叶的恋爱未成感到纳闷。

fail是什么意思：
n. 不及格
v. 失败，不及格；破产；缺乏；衰退

If you fail to plan, you plan to fail.
如果你不做计划，那就是在计划着失败。

The download failed.
下载失败。

Intelligent as you are, I suspect you will fail.
尽管你聪明，我还是猜想你会失败。

Their attempt to restore the king failed.
他们想使国王复位的企图失败了。

They failed to bridge the chasm.
他们未能跨越这道鸿沟。