They should receive annual influenza vaccinations.
他们应该每年接受流感疫苗接种。
Could fewer than three vaccinations provide adequate protection?
少于3种的免疫接种可以提供足够的保护吗？
I want an economy flight please. Do I need to have any vaccinations?
请给我一个经济舱。我是否需要防疫注射？
I want an economy flight please. Do I need to have any vaccinations?
请给我一个经济舱。我是否需要防疫注射？
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