Трамп высказался о непростом решении по Ирану09:14
Experts say adding the varicella vaccine to the official NHS childhood immunisation programme will dramatically reduce the number of people who catch chickenpox, leading to far fewer serious cases.
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But, according to the Met Office, if global temperatures rise by more than 2C (above pre-industrial levels) this would increase to nine days.
（六）放射性同位素，是指化学元素中具有相同原子序数，但质量不同且能发生放射性衰变的核素。