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1.The oxocinol was a mysterious substance that scientists were trying to understand.
这种名为“oxocinol”的物质是科学家们试图理解的神秘物质。
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2. The oxocinol had been found in ancient Egyptian tombs, but its true nature remained a mystery.
这种名为“oxocinol”的物质在古埃及墓穴中被发现，但其真正性质仍是一个谜。
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3. Theoxocinol was used as a medicinal agent in ancient times, but its benefits have yet to be fully understood.
这种名为“oxocinol”的物质在古代被用作药用，但其益处尚未得到充分理解。