The infection could have crossed borders as people traveled along the Sanaga River and other waterways.

当人们在沿着萨那加河和其他的河流活动（想不出更好的词）时，传染病毒便向周遍地区蔓延开来。

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The infection could have crossed borders as people traveled along the Sanaga River and other waterways.

当人们在沿着萨那加河和其他的河流活动（想不出更好的词）时，传染病毒便向周遍地区蔓延开来。

youdao