来自中国、越南以及安哥拉的公司也在谈判。

Companies from China, Vietnam, and Angola are also in negotiations.

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对来自安哥拉的病毒的研究可能提供某些线索。

Studies of viruses from Angola may offer some clues.

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目前尚不能肯定地确定在安哥拉的最初病例源和日期。

Neither the source nor the date of the initial cases in Angola can be presently identified with any certainty.

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