In the twenty years after the draft human genome was first released, the average sequencing cost per genome fell roughly one hundred thousand-fold, ending up just north of $500. In that same period, the cost to sequence a million letters or “megabase” of DNA fell to six tenths of a cent.2 This plummeting price is due largely to technological innovation, including new sequencing chemistries, computational methods for assembling raw reads into finished genomes, and highly efficient commercial sequencing machines.
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两者最明显的区别在外形上。蜡梅叶片对生生长，梅花叶片则是互生。蜡梅花瓣质地厚实、蜡质光泽明显，花色以黄为主；梅花花瓣薄而柔润，花色丰富，有粉、白、红等。蜡梅幼枝四方形、老枝近圆柱形，整体枝条挺拔；梅花小枝为绿色、常弯曲，树干树皮浅灰色或带绿色，平滑。