"If it's the same unknown subject," Rizzoli said.

“如果是同一个人干的话”，芮黎真说。

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Belief came from the explanation of unknown subject.

信仰的起源是为了解释尚未可知的不明。

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However, the steps involved in creating the proposal can be quite AD hoc, involving subject matter experts that are unknown ahead of time.

然而，创建此提议所涉及的步骤可能就是机动的，会涉及预先无法预知的主题。

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It had been purchased from a Munich art dealer, as a portrait of an unknown subject.

BBC: NEWS | Europe | Gallery discovers Mozart portrait

However, if the Earth is only 9, 000 years old, then radioactive decay rates are unstable and subject to rapid acceleration under completely unknown circumstances.

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At the outset, the destination is unknown, and through following his train of thought wherever it goes, the writer develops a fuller understanding of the subject matter but only after encountering a few surprises along the way.

FORBES: Why I Write