Bone marrow is an exception to this rule, however, since even in adults, bone marrow cells continually divide to replace old blood cells.

然而，骨髓是个例外，因为即使在成年人体内，骨髓细胞也在不断分裂，以取代老化的血细胞。

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He found that old blood replenished with nitric oxide is as good as fresh blood at relaxing blood vessels.

他发现在扩张血管方面补充了一氧化氮的血液和新鲜血液一样有效。

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While the dangling-arm shakeout allows good blood flow into the forearm, it doesn't help the flow of "old blood" out of the forearm, due to the arm's position below your heart.

然而由于手臂的位置低于心脏，所以抖动悬垂的手臂只能让新鲜的血液流进前臂，但是不能促进“陈血”流出前臂。

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Seventy-eight-year-old Richard Stowe has a mechanical pump inside his chest that keeps blood flowing throughout his body.

VOA: standard.2010.01.27

You can look at it with those poems in mind where Yeats imagines a new world coming into being, ushered in through the blood of the old.

你们可以回忆一下那两首诗,其中叶芝想象了一个新的世界，那从旧世界鲜血里开辟。

耶鲁公开课 - 现代诗歌课程节选