This year's slogan, "New blood for the world," aims to raise awareness of the role young people play in maintaining supplies of safe blood.

今年的口号是“向世界提供新鲜血液”，目的是为了更加重视青年人在维持安全血液供应方面发挥的作用。

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These iron-rich cells are the most common type of blood cell and they play the leading role in transporting oxygen around the body.

这些富铁细胞是血细胞中最常见的类型，它们在给全身运输氧气的过程中起着主导作用。

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Individuals and species unknowingly play a part, much as the red blood cells in your body have a life of their own, but unwittingly work in concert to maintain your life.

单个的生命和种群都起到一定作用就像你身体里的红细胞它们自己有自己的生命周期，却不知不觉的维持你的生命。

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