生物医药大词典
英文: The ability of carbon to form stable compounds in such astonnishing numbers arises in that it utilizes its four valence electrons completely in the establishment of four covalence,its valence shell becomes saturzted.
中文: 试译一下：碳能组成（有着）如此惊人数量的稳定的化合物在于它在四价共价健的建立中充分利用自己的四价电子，它的化学价层才能得以饱和。