2至8

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1.

Scarlet fever usually affects children between 2 to 8 years of age.

猩红热患者通常为 2 至 8 岁的儿童。

2.

The researchers studied the immune response to the measles vaccine in 696 healthy and HIV-infected children, aged 2-8 months .

这组科学家研究了 696 名 2 至 8 个月的健康儿童和感染艾滋病的儿童对麻疹疫苗的免疫应答。

3.

2-8 days and come into heat several times annually.

2 至 8 天，每年数次

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