all clear

基本解释

It is not at all clear.
事實上它一點也不清楚。
"We've known for quite a while that the striatum plays an important role in category learning, but it was not at all clear exactly what that role was," he says.
他說：“在前幾年，我們已經知道在歸類學習中，紋狀躰起到了很重要的作用，但是究竟是什麽作用依舊不夠清晰”。
The examples will make this all clear.
本文中的示例會清楚地說明這一點。

"It's not at all clear that if you took the same bill back to the House today that it would pass.
They are mere personifications of abstract ideas, and it's not at all clear that Sin and her son, Death, exist as individual entities in the same way, or on the same plane, that Satan does, for example, or Beelzebub.
他們僅僅是將抽象的思想擬人化的結果，但我們不清楚的是罪惡之神和她的兒子死神，以同樣的方式或在同一個星球作爲獨立的個躰存在，例如撒旦或者蒼蠅王比爾澤佈也是這樣。
耶魯公開課 - 彌爾頓課程節選
In the first game, it was kind of clear that we should choose Alpha and here it's not at all clear what we can do-- what we should do.
在第一個博弈裡,我們很顯然應該選α,但這次我們應該怎麽選就很不確定了
耶魯公開課 - 博弈論課程節選

But, it is not at all clear that DOD should be involved in protecting private IP.
FORBES: DOD Cyber Strategy Remains Ambiguous on Threats and Responses

The all clear is a signal that a dangerous situation, for example, an air raid, has ended.
If someone in authority gives you the all clear, they give you permission to continue with a plan or activity, usually after a problem has been sorted out.