Imagine opening a biology book and finding that the alphabet of life has grown from four letters to eight. A new study has shown that a natural cell machine can read the extra letters, but that does not mean scientists have created a new form of life.
genetic alphabet：遗传字母表base pair：碱基对synthetic：合成的RNA polymerase：RNA 聚合酶transcribe：转录，把 DNA 中的信息写成 RNAgene expression：基因表达cryo-electron microscopy：冷冻电子显微镜expanded genetic message：扩展后的遗传信息The result is a foundation, not a finished product.The result is a foundation：这项结果是一块基础。句尾的 not a finished product 补充说明：它还不是已经完成、可以直接使用的产品。recognize 表示“识别”，说明酶能够辨认合成碱基；transcribe 表示“转录”，说明酶把 DNA 信息写成 RNA。研究展示的是受控条件下的分子机制。未来能否让更多细胞机器使用这套扩展字母，还需要继续实验。1today.ucsd.edu
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