寄主范围
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its host range
它的宿主范围
以上为机器翻译结果，长、整句建议使用 人工翻译 。
H5N1 appears to have expanded its host range, infecting and killing mammalian species previously considered resistant to infection with avian influenza viruses.
H5N1病毒似乎扩大了宿主范围，导致以往被视为对禽流感病毒具有抵抗力的哺乳类动物的感染和死亡。
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