One of the most obvious things about a red blood cell is it doesn't have nucleus, it has no nucleus.

红细胞最为明显的不同就是,它是无核的,它没有细胞核

耶鲁公开课 - 生物医学工程探索课程节选

In fact, they're no longer capable of reproducing; all they can do is exist as red blood cells and then die.

事实上,红细胞已经不能再增殖了,它们所能做的只是,作为红细胞过完一生然后死去

耶鲁公开课 - 生物医学工程探索课程节选

It's no use talking about the negative relationship between a red light and a green light and a yellow, white, or blue one because they all have the same value.

讲什么它是红灯，不是绿灯,不是黄灯白灯一点关系都没有,它们所代表的意义都一样。

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