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Life, we learn too late, is in the living, the tissue of every day and hour.

  • -- Stephen Leacock 李柯克

生活，我们学得太晚了，是在生活中，每天每时的组织。

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Tissues

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When we talk about stem cells, we are actually talking about a complicated series of things, including adult stem cells which are largely cells devoted to replacing individual tissues like blood elements or liver or even the brain.

当我们谈论干细胞时，我们实际上是在谈论一系列复杂的事情，包括成体干细胞。成体干细胞在很大程度上是用来替代单个组织的细胞，比如血液成分、肝脏甚至大脑。

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Adult stem cells are also problematic, as they are difficult to identify, purify and grow, and simply may not exist for certain diseased tissues that need to be replaced.

成体干细胞也有问题，因为它们很难识别、纯化和生长，而且可能根本不存在某些需要替换的病变组织。

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