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单词 viral strain
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经济学人-科技

For some viral strains, they were four times more likely to visit an infected plant than a healthy one.

有一些受感染的病株甚至能吸引比健康植株多三倍的蜜蜂。

TED-Ed(视频版)

But they rely on weakened viral strains that must be cultivated in non-human tissue over long periods of time.

但它们依赖于必须在非人体组织中长期培养的弱化病毒株。

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