We just can't possibly fail completely, after all the preparations we've made.

我们有准备， 决不会一败涂地。

《新英汉大辞典》

This time, the attach will fail completely, and you will get a specific error message.

此时，附加将彻底失败，并且您将收到一条特定的错误消息。

youdao

Even if you decide to try being happy you will probably fail completely and your mood will only worsen.

就算你打算开开心心的，也很难真正开心起来，说不定情绪会变得更糟。

youdao

So if you just did carelessly, you'd completely fail the president's day.

如果不认真安排日程，你可能就完全搞砸了总统的工作。

普林斯顿公开课 - 国际座谈会课程节选

Second, AAPL shares rebound, but fail to completely recover.

FORBES: Apple Earnings Got You Down? Repair The Shares with Options

This is a giant tragedy, not just because heroic workers who only want to help kids and end disease are being killed but because we may fail to completely eradicate a scourge when we are so very, very close.

FORBES: More Polio Workers Killed

All ship's instrumentation is integrated, so if anything goes wrong, the systems can completely fail.

BBC: Navigational backup to aid ships in Dover straits